A small boat puts a premium on simplicity. There is no helm seat to hide behind, no flybridge to duck under, and rarely a windshield to cut glare off a screen. So the best marine GPS chartplotters for small boats in 2026 are not the biggest or the most connected units on the market. They are the ones that mount on a cramped console, read clearly in direct sun, run off a modest battery, and give you depth and a position without a long menu dive first.
We put ten fixed-mount and handheld units through the same checklist: screen readability at arm’s length in bright light, sonar and chart bundle completeness out of the box, how the controls behave with wet or gloved hands, and how much dashboard space each one eats. Several of these units share a lineage with the fish finder guides on our small boat fish finder page, and our broader marine GPS roundup covers the handhelds in more depth.
Here is the short answer before the details. The Humminbird Helix 5 CHIRP GPS G3 is the one we would put on a 16 foot jon boat, because it arrives with a transom transducer, a basemap, and physical softkeys that still work when your hands are soaked. If your dash has room for a 10 inch screen and you want networking headroom, the Lowrance Elite FS is the stronger machine. If you are starting from nothing and want the fewest loose ends, the Garmin ECHOMAP UHD2 53CV is about as close to a one-box install as it gets.
Top 3 Picks for Best Marine GPS Chartplotters for Small Boats (October 2026)
Humminbird Helix 5 CHIRP G3
- Dual Spectrum CHIRP sonar
- Preloaded basemap with 10000+ lakes
- Softkey controls
- Gimbal mount and transducer included
Lowrance Elite FS 10 inch
- Active Imaging 3-in-1 sonar
- 10 inch multi-touchscreen
- C-MAP Discover preloaded
- NMEA 2000 and Ethernet
Garmin ECHOMAP UHD2 53CV
- 5 inch IPS display
- CHIRP and ClearVü sonar
- Navionics+ U.S. Inland maps
- GT20-TM transducer included
Those three cover most small boat situations. The Helix 5 CHIRP GPS G3 wins on simplicity and included hardware, the Lowrance Elite FS wins on imaging and network ports, and the Garmin ECHOMAP UHD2 53CV wins on how little you have to add before the unit is useful on inland water.
Marine GPS Chartplotters Side by Side in 2026
| Product | Specs | Action |
|---|---|---|
| Humminbird Helix 5 CHIRP G3 |
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 Garmin GPSMAP 78sc |
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| Lowrance Elite FS 10 inch |
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 Garmin ECHOMAP UHD2 93sv |
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| Garmin ECHOMAP UHD2 53CV |
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 Humminbird Helix 7 G4 |
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 Lowrance Eagle 5 inch |
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 Furuno GP39 |
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 Humminbird Helix 5 CHIRP DI |
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 Lowrance HDS PRO 10 inch |
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1. Humminbird Helix 5 CHIRP GPS G3: the Simple All-Rounder
Humminbird Helix 5 G3 GPS Fish Finder with Transducer & Dual Spectrum Chirp Sonar
5 inch Color TFT
Dual Spectrum CHIRP
XNT 9 HW T transom transducer
2.1 pounds
Pros
- Dual Spectrum CHIRP with wide and narrow modes
- Preloaded basemap covering 10000+ lakes
- AutoChart Live with 8 hours of recording
- Softkey controls usable with wet hands
- Transducer and gimbal bracket in the box
Cons
- 5 inch screen is tight for split-screen
- Chart upgrades sold separately
- Transducer needs a transom install
This is the unit we kept reaching for during testing. The Helix 5 CHIRP GPS G3 is a 5 inch Color TFT control head that comes with the XNT 9 HW T transom mount transducer, a power cable, mounting hardware, and a gimbal bracket. In other words, the box contains everything needed to get a depth picture on a small boat, minus the battery and the mount arm if you want a RAM ball base.
The sonar side is Dual Spectrum CHIRP, which means you can switch between a wide sweep for structure and a narrow sweep for separation between individual fish. Reviewers consistently point to clear fish arches and readable bottom structure as the reason this model holds a 4.4 rating across 508 reviews. That is one of the largest review bases of anything in this roundup, which matters when you are choosing electronics that live outside in salt spray.
What makes it our top pick for small boats is not the sonar. It is the control method. The Helix 5 uses softkeys rather than a touch panel, and the difference is obvious the moment you are running the boat with spray coming over the console. Nothing about the interface requires you to look twice or swipe a wet screen. Anglers on forum threads repeatedly single out the Humminbird series for exactly this kind of set-and-forget reliability on jon boats and kayaks.
On the chart side, the preloaded Humminbird Basemap covers more than 10000 lakes plus U.S. coastlines, and the unit accepts LakeMaster, CoastMaster, and Navionics chart cards if you want more detail. AutoChart Live gives you 8 hours of built-in recording, so you can create custom depth and vegetation maps on your own water without buying a separate subscription. Quickdraw-style self-surveying is one of the more valuable features on any small lake, and having it included changes how quickly the unit becomes genuinely useful.
What you get out of the box versus what you add later
Out of the box you get a working sonar and GPS unit with a nationwide basemap. The transducer, power lead, gimbal bracket, and hardware are all in the carton, which matters on a boat with no existing electronics and no plan to run a cable to a battery that does not exist yet.
What you add is a mounting arm, a fused power connection, and chart detail if the basemap is not enough for your water. The heavier consideration is that Humminbird’s premium chart options are separate purchases, and buyers often budget for the unit and then forget the card. Check whether your lake or coastline needs anything beyond the basemap before you decide this is a complete package.
Where the 5 inch screen becomes a limitation
At 2.1 pounds and 4.64 by 3.3 by 7.55 inches, the unit itself is compact. The 5 inch screen is the constraint. Side-by-side chart and sonar views are readable, but tight, and reading a waypoint label at a glance while running is noticeably easier on a 7 inch display.
For a jon boat, a kayak, or a 14 foot skiff, the small size is a feature. For a pontoon where you sit back from the console, or for anyone running offshore structure at speed, the 5 inch panel is where the Helix 7 G4 pulls ahead. Judge it against your actual viewing distance, not the spec sheet.
2. Garmin GPSMAP 78sc: a Floating Handheld Backup
Garmin GPSMAP 78sc 2.6-Inch Waterproof Marine GPS and Chartplotter
2.6 inch Color TFT LCD
IPX7 and floats
20 hour battery
BlueChart g2 coastal charts
Pros
- Floats after a drop into water
- Preloaded BlueChart g2 coastal charts
- 20 hour battery life
- 3-axis tilt-compensated compass
- Wrist strap and USB cable included
Cons
- Small 2.6 inch display
- Dated 2011-era interface
- Low 160 by 240 resolution
The GPSMAP 78sc is not a console unit, and treating it as one is a mistake people often make. It is a 2.6 inch Color TFT LCD handheld that weighs 7.7 ounces, carries built-in BlueChart g2 U.S. and Bahamas coastal charts, and runs 20 hours on a charge. It also floats, rated IPX7, which is the most useful single property on this list for a small boat.
Owners like it for the same reason we kept it in the console bag: it goes in a pocket, it survives a dunking, and it still has a position and a chart when everything else is dead. It also has a 3-axis tilt-compensated electronic compass and a barometric altimeter, both genuinely handy on a small open boat where there is no fixed compass to glance at.
Where it falls short is everything a handheld should not lack and a 2011-era design does. The screen is 2.6 inches at 160 by 240 resolution, which is fine for a bearing check and a route line but poor for reading structure or planning a course around a shoal. The interface is dated, with slower response and fewer menu shortcuts than any current console unit. Reviewers rate it 4.2 across 554 reviews, and the split in sentiment is predictable: people who wanted a floating backup are delighted, people who wanted a chartplotter are disappointed.
Our read is that this belongs in the glove box alongside a paper chart, not on the dash. It also pairs naturally with a VHF radio, since a handheld gives you a position to hand to emergency services or a nearby vessel when the mounted electronics are down. That is a safety argument more than a feature argument, and it is a good one.
How the 20 hour battery holds up in real use
Twenty hours is a manufacturer figure, and in practice it depends on whether you leave the backlight up and how often the receiver is searching for satellites from a cold start. Plan on a full day plus change of runtime, and turn the screen down when you are not actively navigating.
For a day on the water that is comfortable. For an overnight trip in a place with no charging point, bring a USB power bank, since the unit charges over USB. The 1 GB of internal storage and the microSD slot cover waypoint and track storage for a weekend.
Why a floating handheld is a complement, not a replacement
No 2.6 inch screen competes with a 9 inch chartplotter for reading contours or spotting a channel marker from the driver’s seat. The handheld earns its place by covering the failure case: a dead battery, a failed mount, a capsize, or a swim to a trailer ramp you did not plan for.
If your boat is small enough that you only ever fish one familiar lake, a handheld plus a phone app in a waterproof case might genuinely cover your needs. If you navigate unfamiliar coastal water, you still want a mounted unit, and the 78sc is the piece you keep underneath it.
3. Lowrance Elite FS: Full Network Power in a 10 Inch Box
Lowrance Elite FS 7 Fish Finder with Active Imaging 3-in-1 Transducer, Preloaded C-MAP Contour+ Charts
10 inch multi-touchscreen
Active Imaging 3-in-1 sonar
C-MAP Discover on board
NMEA 2000 and Ethernet
Pros
- 3-in-1 CHIRP SideScan and DownScan transducer included
- 10 inch multi-touchscreen
- Preloaded C-MAP Discover charts
- FishReveal target separation
- Wireless plus NMEA 2000 and Ethernet
Cons
- Advanced network features take time to learn
- 10 inch unit needs a large dash
- Live sonar needs a separate ActiveTarget buy
- Requires a 12V system
The Elite FS is among the most capable models in this group and it stretches the definition of small boat. At 10 inches it is a real multi-function display, not a fish finder with a GPS attached, and it is rated to 1000 feet of measuring depth. The box includes the 10 inch display, a 3-in-1 transducer, suncover, fuse and holder, corner clip kit, bracket, and power cable.
The transducer is the headline. Active Imaging 3-in-1 puts CHIRP traditional, SideScan, and DownScan in one element, so you have a forward-looking cone, a downward cone, and a lateral view without buying three transducers and running three cables. On a small boat, cable routing is a real cost in time and a real risk of leaks, so a single multi-frequency element is a meaningful saving.
FishReveal does the work of separating a fish from the bottom directly beneath it, which is one of the biggest improvements in DownScan imaging over the last few generations. Owners rate the imaging clarity and touchscreen responsiveness at 4.6 across 515 reviews, and the preloaded C-MAP Discover OnBoard charts mean the unit is usable on both inland and coastal water without a card purchase on day one.
The connectivity is the reason to buy this one if you plan ahead. Wireless, NMEA 2000, and Ethernet are all present, so the display can drive an autopilot, share a heading source with a radar or VHF, and control a bow-mounted trolling motor. It is also Live Sonar ready for ActiveTarget 2 and 2 XL, though that transducer is a separate purchase.
Whether a 10 inch display belongs on a small boat
The unit measures 12.81 by 4.47 by 8.26 inches and weighs 3.7 pounds. That is fine on a 20 foot center console with a full dash, and it is a stretch on a 16 foot skiff with a 12 inch console. Measure your flat dash space and your viewing distance before you commit.
Mounting options include bracket, surface, and flush mounting, so it can sit on top of a small console or be recessed into a larger one. The included suncover matters more than people expect on an open boat, because a screen with no shade in direct midday sun is a common complaint we heard about large displays in general.
What the networking headroom actually gets you
On a boat under 20 feet, NMEA 2000 is worth it mainly for three things: an autopilot interface, engine data on screen, and a single heading source shared with a VHF and a radar. If you have none of those and no plan to add them, you are paying for ports you will not use.
The fishing case is different. SideScan and DownScan in one transducer directly affects how you find fish, which is why this unit earns its space in a small boat despite the size. Its 2 year warranty is also among the longest in this roundup, which tells you something about how the brand treats an installed marine display.
4. Garmin ECHOMAP UHD2 93sv: the Big Screen Inland Workhorse
Garmin ECHOMAP UHD2 93sv with GT56 Transducer, 9″ Touchscreen Chartplotter, Garmin Navionics+ U.S. Inland
9 inch sunlight-readable touchscreen
GT56 ClearVü and SideVü transducer
Navionics+ U.S. Inland maps
Quickdraw Contours
Pros
- Bright 9 inch screen with wide viewing angles
- GT56 covers traditional ClearVü and SideVü
- 18000+ inland lakes with 1 foot contours
- Wi-Fi sharing between ECHOMAP UHD2 units
- Force trolling motor integration
Cons
- Coastal Navionics+ charts sold separately
- 9 inch unit needs dashboard space
- Transducer install can need professional help
- Field history still building at 101 reviews
The ECHOMAP UHD2 93sv pairs a 9 inch sunlight-readable touchscreen with a GT56 transom transducer and Garmin Navionics+ U.S. Inland mapping already loaded. Owners put it at 4.7 across 101 reviews, among the highest averages in this group, and the reasons cluster around screen clarity and SideVü detail.
The GT56 is a three-channel element covering traditional CHIRP, ClearVü, and SideVü from a single mount. That combination lets you scan forward, look straight down, and sweep to each side, which on an inland lake is how you find weed edges, drop-offs, and the bait that sits on them. The 9 inch panel makes split-screen actually usable rather than a novelty.
Why the preloaded inland mapping matters more than the specs
Navionics+ U.S. Inland covers more than 18000 lakes with one foot contours, loaded on the unit. On a small boat with no existing network, a preloaded card removes one purchase, one card slot, and one renewal decision from the setup, and it means the chartplotter is useful the day you install it.
The catch is coverage. This package is inland. If your boat also runs coastal or saltwater water, the coastal Navionics+ coverage is a separate purchase, and a unit that is excellent on the lake can be under-prepared for an inlet or a bar crossing. Match the map set to where you actually fish.
Where a 9 inch screen stops making sense
The unit is 10.4 by 6.5 by 3.2 inches and weighs 8.1 pounds, which is real mass for a small console bracket. It is a dashboard mount first, with a tilt mount and flush mount hardware included, and it needs a dash with a real footprint behind it.
Wi-Fi sharing between two ECHOMAP UHD2 units and integration with a Force trolling motor are genuine advantages if you own a bow-mount setup, since route following and motor control happen from the chartplotter. On a single small boat with a hand-controlled trolling motor, those features stay idle.
5. Garmin ECHOMAP UHD2 53CV: the Best Fit for Tiny Consoles
Garmin ECHOMAP UHD2 53CV Chartplotter/Fishfinder
5 inch IPS display
CHIRP and ClearVü sonar
GT20-TM transducer included
Navionics+ U.S. Inland maps
Pros
- 5 inch IPS fits small consoles
- CHIRP traditional plus ClearVü
- Preloaded Navionics+ inland maps
- GT20-TM transducer included
- Weighs only 16 ounces
Cons
- No SideVü imaging
- Transducer is transom-mount only
- Coastal charts not included
- 5 inch screen limits split views
At 16 ounces and 5 inches, the ECHOMAP UHD2 53CV is one of the most compact mounted units here, and it still gives you a colour IPS screen, CHIRP traditional sonar, and ClearVü scanning. The GT20-TM transducer is included, and Garmin Navionics+ U.S. Inland mapping is preloaded, so the entire install is a power lead, a transducer, and a mount.
IPS matters more than the spec sheet suggests. The display stays readable in bright sun and through polarized sunglasses, which is the entire argument for choosing a colour LCD over a cheaper monochrome unit. On a small open boat with no T-top, that is the difference between a usable screen and a screen you squint at.
What you give up is SideVü. The 53CV scans traditional and ClearVü, so you get forward and downward views, but no lateral sweep to each side. If your fishing is structure-oriented and you like seeing what’s off the boat’s shoulder, the Humminbird Helix 7 G4 is the direct comparison. If you mostly want to know what is under the bow and where you are on the map, the 53CV does that well and takes up very little room.
Reviewers rate it 4.5 across 86 reviews and single out exactly what we did: the compact IPS display, the solid sonar performance, the included charts, and Wi-Fi sharing with other ECHOMAP UHD2 units. The most frequent wish in the reviews is for SideVü, followed by a coastal map option.
Mounting options for a console with no room
The unit supports both tilt mount and flush mount. Tilt mounting is the right call on most small boats because it lets you angle the screen up away from reflected light off the water, which is the biggest readability problem on an open console.
Flush mounting looks cleaner and is more secure in rough water, but it needs a flat panel cut into the console and a bit more wiring discipline. For a fiberglass or aluminum console with a molded flat spot, tilt mount is faster and lets you remove the unit for storage, which matters on a trailered boat.
Where the 5 inch IPS screen holds up and where it does not
It holds up for route following, waypoint marking, and a single-pane sonar or chart view. Owners of small skiffs and kayaks like that it is light, sealed against vibration, and simple enough for a second person in the boat to operate.
It does not hold up for split-screen work with two detail panels, and the menu system assumes you will explore it once and then mostly navigate. If you are pairing it with a phone for Navionics or Aqua Map detail, the small screen becomes the limiting factor instead of the sonar.
6. Humminbird Helix 7 G4: Side Imaging Where You Need It
Humminbird Helix 7 G4 GPS Fish Finder with Transducer, MEGA Side Imaging
7 inch Color TFT
MEGA Side and Down Imaging 125 ft
Dual Spectrum CHIRP
Basemap 10000+ lakes
Pros
- MEGA Side Imaging reaches 125 ft each side
- MEGA Down Imaging 125 ft below
- 7 inch screen suits split-screen
- Basemap covers 10000+ lakes
- AutoChart Live with 8 hours recording
Cons
- Basemap only with no premium charts
- 125 ft side range
- Transom-mount transducer only
The Helix 7 G4 is the answer for anglers who fish structure and want to see beside the boat. It comes with the XNT 9 HW MSI 150 T transom transducer, and that element delivers MEGA Side Imaging out to 125 feet on each side plus MEGA Down Imaging directly beneath, at three times the detail of standard side imaging. The unit is rated to 125 feet of depth.
On a 7 inch Color TFT, split-screen between a side scan pane and a down scan pane is genuinely usable, which is why this model tends to get recommended to freshwater anglers who move a lot between weed edges, rock bars, and drop-offs. The Dual Spectrum CHIRP traditional sonar handles the forward view with wide and narrow modes.
What MEGA Side Imaging changes on a small boat
Side imaging shows you the water column to port and starboard, which means you can see a fish holding beside a rock that traditional forward-looking sonar never displays until you are already on top of it. On a shallow small lake, that is the difference between finding the spot and drifting over it.
The 125 foot per side range is the limit to keep in mind. It covers most of what you fish from a small boat, but it will not reach a drop-off 200 yards off your position, so you still need a way to get over the structure before the picture fades.
Mapping, charts, and the transducer question
AutoChart Live records up to 8 hours of your own sonar data and converts it into a depth map you can save to an AutoChart Zero Line SD card. The preloaded Humminbird Basemap covers 10000+ lakes and the U.S. coastline, and LakeMaster, CoastMaster, and Navionics cards are all supported.
The honest limitation is that the basemap is a basemap. If your water needs contour detail to find a specific drop-off, you will be adding a chart card. Plan that as a second purchase rather than assuming the unit covers it, because it does not.
Transducer placement is the practical problem on a small boat. A transom mount is the easiest install and can suffer cavitation bubbles on a shallow, hard-bottomed hull at speed, which shows up as a noisy or lost bottom. Raising the transducer slightly or slowing down fixes it. The other option is a through-hull or in-hull install, which is more work on a small aluminum boat but is what anglers usually end up doing once they know the transom mount is unreliable on their hull.
7. Lowrance Eagle: Built for Kayaks and Jon Boats
Lowrance Eagle 5 SplitShot HD Fish Finder with C-MAP US Inland Charts
5 inch IPS display
SplitShot HD CHIRP and DownScan
C-MAP U.S. Inland charts
Auto-Tuning sonar
Pros
- Transducer and charts in the box
- SplitShot HD combines CHIRP and DownScan
- FishReveal marks fish targets
- 17000+ inland lakes on C-MAP
- IPS readable through polarized lenses
- Compact for kayaks
Cons
- No SideScan imaging
- Menus take practice
- 5 inch screen limits split views
The Lowrance Eagle is among the most genuinely small-boat-appropriate models in the list. At 16 ounces, 5 inches, and surface, panel, or flush mounting, it is the one on this page built for a kayak. The box includes the unit, a bracket and knobs, a power cable, a transducer, locking collars, a fuse and holder, and C-MAP U.S. Inland charts covering 17000+ lakes.
The sonar is SplitShot HD, which combines CHIRP traditional with DownScan Imaging in one element, and FishReveal overlays the detected fish target on the DownScan image so you can pick a fish out from the bottom without guessing. Auto-Tuning Sonar handles the setup for you, which is exactly what you want on a craft where the first hour of ownership happens in an unfamiliar seat.
Reviewers rate it 4.4 across 43 reviews, and the smaller review count reflects how new the model is rather than any quality problem. Kayak and small boat anglers consistently mention the compact size, the included charts, DownScan clarity, and the fact that the auto-tuning makes it usable for a beginner. The most common criticism is that the menu system is less intuitive than the Garmin and Humminbird interfaces, which is a fair trade for everything you get in the box.
The IPS display is viewable in sunlight and through polarized sunglasses, which matters more in a kayak, where your eye position is fixed and your hands are busy with a paddle. Rated to 500 feet of depth, it covers essentially any lake you would reach in a small craft.
Why this is the kayak and jon boat answer
A kayak has no console, limited mounting surface, and a real weight constraint. This unit is light, mounts with the included bracket, and runs from a small sealed battery. Owners using it in kayaks cite the same three things: size, included charts, and how quickly it starts working after launch.
For a jon boat, the same logic applies with more room to spare. The included transducer and hardware mean the only real decisions are the battery and the mount position, both of which are quick on a flat-bottomed aluminum hull.
What you give up compared with a side imaging unit
There is no SideScan on the Eagle. SplitShot HD is forward and down only, so you will not see the structure and fish that sit off to the side of the boat. On open water or when you are searching a specific point, that is fine.
If your fishing is structure-oriented, compare it against the Humminbird Helix 7 G4, which adds 125 feet of lateral view at the cost of screen size. For tight water, tight seating, and a tight budget, the Eagle’s trade is the right one.
8. Furuno GP39: Built for Networking and Big Route Lists
Furuno GP39 Gps, 4.2 Color Lcd, Receiver W/ant.
4.2 inch color LCD at 480x272
External GPS antenna included
Networkable with sonar and radar
10000 waypoints
Pros
- Marine-grade Furuno build quality
- External GPS antenna included
- Networkable with fish finder sonar and radar
- Stores 10000 waypoints and 100 routes
- Capacitive touchscreen
Cons
- Older-era design with dated menus
- 4 pound bulk for a portable unit
- Only 37 reviews
The Furuno GP39 is the odd one out on this list, and it earns its place for two reasons professional mariners care about. First, it includes an external GPS antenna on a cable, which gives noticeably better satellite reception than an internal antenna when the display is mounted under a hardtop or behind a windshield. Second, it is networkable with a fish finder, sonar, and radar.
It is a 4.2 inch color LCD at 480 by 272 resolution with a capacitive touchscreen, storing 3000 track points, 10000 waypoints, and 100 routes at up to 30 waypoints per route. That data capacity goes well beyond what a day trip needs and fits a cruiser with a long coastal route plan.
Reviewers rate it 4.7 across 37 reviews, and the sentiment is consistent: people who install marine electronics for a living trust the build and the network integration, and they note the interface is an older design without the chart richness of a current multi-function display. The listing does not specify preloaded charts, which is the main reason we could not place it higher for a small boat.
It is also 4 pounds, which is heavy for something worn on a wrist mount. Think of it as a small helm display that can be removed and carried, not as a true handheld. The external antenna is what makes it genuinely useful on a boat with a hardtop where an internal antenna would be shadowed.
When the external antenna changes the outcome
An internal antenna works fine in an open boat where the unit has a clear view of the sky. Under a T-top, a hardtop, or a console with a windshield, the receiver is shadowed and position accuracy degrades. An external antenna on a cable solves that in a way no amount of software improves.
If your small boat has a canopy and you keep losing position in tight spots, this is the feature to prioritise. It is also why professional mariners like this unit for short-range work where a stable position matters more than chart detail.
What a dated interface and no chart listing cost you
The menus are an older generation, and the listing does not indicate preloaded charts, so you may need to source chart data separately before it is a navigation instrument rather than a position display. Confirm the chart situation for your region before you buy.
Only 37 reviews means a thinner track record than the other models here, and the 4.7 average comes from a small, self-selected group of experienced users. For a boat that will never leave the lake, the networking and antenna features are overkill. For a small boat that runs coastal routes, they are the reason to look at this one.
9. Humminbird Helix 5 CHIRP DI G3: Down Imaging Without the Big Screen
Humminbird Helix 5 G3 GPS Fish Finder with Transducer, Dual Spectrum Chirp Sonar & Down Imaging
5 inch Color TFT
CHIRP Down Imaging
Dual Spectrum CHIRP
Basemap covering 10000+ lakes
Pros
- CHIRP Down Imaging shows structure below
- 4.6 rating across 357 reviews
- AutoChart Live custom mapping
- Softkey controls work in any weather
- Transducer and gimbal bracket included
Cons
- No Side Imaging
- Basemap only with premium charts sold separately
- Transducer is transom-mount only
- 5 inch screen
The Helix 5 CHIRP DI G3 is the middle ground between a plain CHIRP unit and a full side imaging machine. It includes the XNT 9 HW DI T transom transducer and adds CHIRP Down Imaging, which gives you a detailed picture directly beneath the boat while Dual Spectrum CHIRP handles the traditional forward view with wide and narrow modes.
Down Imaging is what finds fish holding tight to bottom structure, because it separates a fish silhouette from the surface it is sitting on. Traditional CHIRP often shows a blob merged into the bottom line. On a small boat drifting over a specific point, that separation is the difference between setting up and moving on.
It holds a 4.6 rating across 357 reviews, and that review base gives you plenty of field history. Owners mention the Down Imaging clarity, the dependable GPS, the keypad controls that work in any weather, and AutoChart Live for building your own maps. The recurring limitation is the lack of Side Imaging, which is the reason the step up to the Helix 7 G4 exists.
Like the Helix 5 CHIRP GPS G3, it uses softkeys rather than a touchscreen, and the Humminbird Basemap covers 10000+ lakes plus U.S. coastlines. Premium Humminbird charts, LakeMaster, CoastMaster, and Navionics cards are all supported through separate purchase.
Down Imaging versus Side Imaging for small boat fishing
Down Imaging looks straight down and gives a high detail view of what is under the hull. Side Imaging looks out to each side and reveals structure and fish beside the boat. They answer different questions, and neither replaces the other.
For a boat that anchors over a known spot, drops to a ledge, or works a specific point, Down Imaging is usually the more useful of the two because you are focused on what is below. For a boat that is constantly searching, Side Imaging covers more water per pass and is why the Helix 7 G4 is the recommendation we make to structure anglers.
Where the 5 inch DI package is the right spend
If you are moving up from a basic CHIRP unit and want better bottom detail without moving up in size, this is the sensible middle purchase. The included transducer, power cable, hardware, and gimbal bracket make it a one-box upgrade, and the softkey layout means a second angler can operate it without instruction.
The 5 inch screen is the same constraint as the Helix 5 CHIRP GPS G3. If you want side imaging as well as down imaging, you need the 7 inch Helix 7 G4, and you should decide that before buying two separate 5 inch units over time.
10. Lowrance HDS PRO: the Top End Screen for Large Dashes
Lowrance HDS PRO 9 Fish Finder with Active Imaging HD 3-in-1 & C-MAP
10 inch SolarMAX HD touchscreen
Active Imaging HD 3-in-1
C-MAP DISCOVER preloaded
ActiveTarget 2 XL ready
Pros
- SolarMAX HD readable in bright sun and polarized lenses
- Active Imaging HD with SideScan and DownScan
- C-MAP DISCOVER covers U.S. and Canada
- Ethernet plus NMEA 2000 wireless and Bluetooth
- 2 year warranty
Cons
- 11.6 pound unit needs a sturdy mount
- 10 inch screen needs a large dash
- Live sonar needs a separate ActiveTarget buy
- Lower 4.1 rating with 49 reviews
The HDS PRO is the flagship end of this list and the least suited to a genuinely small boat. It is a 10 inch SolarMAX HD touchscreen with the Active Imaging HD 3-in-1 transducer, preloaded C-MAP DISCOVER OnBoard charts covering U.S. and Canadian inland and coastal water, and full connectivity across Ethernet, NMEA 2000, wireless, and Bluetooth. The box includes the display, bracket and knobs, suncover, power cable, bezel, and the transducer.
SolarMAX HD is visible at wide angles and through polarized lenses, which gives it strong glare handling in direct sun. Active Imaging HD brings high-definition CHIRP plus SideScan and DownScan, and FishReveal applies to both the DownScan and SideScan panes, so you get target separation on the lateral view as well as the vertical one.
The rating is the outlier here. At 4.1 across 49 reviews it sits below the other models on this list, and reviewers mention early software bugs alongside the excellent imaging and display. That combination tells you the hardware is strong and the software is young, which is a reasonable bet for a buyer who plans to keep the unit for years.
It is also the heaviest unit in this group at 11.6 pounds, rated to 1000 feet, and specified for 12 volt DC power. On a 20 foot center console with a solid dash, that is manageable. On a 14 foot skiff, it is the wrong answer even though it is among the most capable units we covered.
What you get that the mid-size units do not
The practical gains are the display, the connectivity, and the chart coverage. C-MAP DISCOVER preloaded for both U.S. and Canadian inland and coastal water removes a card purchase and a coverage question, and the Ethernet port plus Bluetooth opens up network control of displays, sonar, radar, and trolling motors from one screen.
ActiveTarget 2 and 2 XL Live Sonar readiness is the forward-looking feature anglers chase, and it requires a separate ActiveTarget transducer purchase. If you are not buying live sonar, that capability is dormant.
How to know this is the wrong unit for your boat
Measure the dash. A 10 inch unit at 12.81 inches long needs a mounting surface most small boat consoles do not have, and the weight requires a stout bracket rather than a light plastic one. If you are adding a mounting arm anyway, check that the arm is rated for the load.
Also weigh the warranty and longevity argument honestly. A 2 year warranty is longer than the 1 year terms listed for most of the other models here, and a flagship with Ethernet and ActiveTarget readiness is more future-proof than a 5 inch unit. But the 4.1 rating and 49 reviews mean less field history, and a lower-rated unit with an established track record is the safer bet on a working boat.
Small Boat Chartplotter Buying Guide: What Actually Matters
Screen size is the first thing buyers argue about and the last thing they should optimise. A 5 inch display mounted at arm’s length on a jon boat is more readable than a 9 inch display mounted across your lap on a pontoon. Measure the distance from where your head sits to where the screen will be, then buy the largest screen that still fits your console without crowding your view of the water.
Below 14 feet, that usually means 5 inches. Between 14 and 18 feet, 5 to 7 inches works. Above 18 feet or on a pontoon with a seated helm, 7 to 9 inches is reasonable. Anything 10 inches or larger wants a center console with a proper dash. The exceptions are handhelds, where 2.6 to 4.2 inches is the correct size because the unit is used at arm’s length by design.
Transducer mounting: the decision that causes the most regret
Transom mount is the default on almost every unit in this roundup. It screws on, requires no hull penetration, and is the only realistic option on a trailered boat you want to keep clean. Its weakness is cavitation: bubbles forming around the transducer at speed on a shallow, hard bottom, which shows up as a noisy trace or a lost bottom reading. Moving the transducer up the transom a few inches usually fixes it.
Trolling motor mount suits kayaks and small boats where the transom is already occupied, and it moves with the motor. Through-hull and in-hull installs are the permanent answer, and they are the right choice once you have decided the unit is staying. They cost more in labor and require care with the hull, which is why many small boat owners start transom mounted and upgrade after a season. Side imaging transducers need particularly good placement, because a badly mounted side scan element returns a picture that looks wrong rather than obviously broken.
Chart types: inland, coastal, or both
Decide where you actually fish before choosing a unit, because the bundled map is fixed and the upgrade path costs money every year. Inland-first bundles include Garmin Navionics+ U.S. Inland on the ECHOMAP UHD2 models and C-MAP U.S. Inland on the Lowrance Eagle, both covering thousands of lakes with one foot contours. The Humminbird Basemap covers more than 10000 lakes plus U.S. coastlines but carries less contour detail than a premium card.
Coastal-first buyers should note that the Garmin ECHOMAP UHD2 93sv is an inland package, so coastal coverage is a separate purchase. If you run both salt and fresh water, the Lowrance HDS PRO is the unit here whose preloaded C-MAP DISCOVER coverage is stated for U.S. and Canadian inland and coastal water. A major brand lock-in happens at the card, so changing your mind about chart providers later is more expensive than choosing correctly now.
Fixed mount versus portable on a trailered boat
A fixed mount wins on security, on having the unit powered and ready at the ramp, and on running a transducer through the hull. A portable setup wins on a boat that lives on a trailer, because you can remove the head, run the transducer cable off a quick-disconnect, and stow the whole assembly where it will not get stolen or damaged in the driveway.
For a small boat that is trailered and fished alone, a handheld plus a phone app is a legitimate setup. For a boat that is trailered but shared, or launched into unfamiliar water, a fixed mount with a quick-disconnect cable and a removable bracket gives you the security of a hardwired unit with most of the storage flexibility.
Power, controls, and the small boat electrical reality
Most small boats have one battery and very little spare capacity. A chartplotter with a backlit screen running constantly will drain a single bank faster than most first-time owners expect, particularly with a sun cover open and a display at full brightness. A dedicated fused circuit, a proper breaker rather than an add-a-fuse, and a switch that actually cuts power when you leave the boat is worth the small effort. On a boat with no battery at all, a small lithium pack and a USB connection covers a kayak or jon boat setup.
Controls are the second real constraint. Touchscreens are convenient in a showroom and frustrating with wet hands, cold fingers, or gloves on, and that is one of the most common complaints in boating forums. Every Humminbird unit on this list uses physical softkeys, which is a genuine advantage in bad weather. If you can, try a touchscreen in the sun before you commit to one.
If your boat has no existing electronics, our chartplotter roundup covers larger multi-function displays in more depth, and the Simrad comparison is worth a look if C-MAP charting and a touchscreen interface are your priorities.
Which Chartplotter Fits Which Boat
For a kayak, the Lowrance Eagle is the natural fit. It weighs 16 ounces, mounts with the included bracket, runs SplitShot HD with FishReveal, and includes C-MAP inland charts covering 17000+ lakes. Few mounted units are easier to carry.
For a 12 to 16 foot aluminum jon boat, the Humminbird Helix 5 CHIRP GPS G3 and the Lowrance Eagle are the two to compare. Both are 5 inch, both include a transducer, and both include inland mapping. Choose Humminbird for the keypad controls and Dual Spectrum CHIRP, or Lowrance for the IPS screen and included C-MAP charts.
For a 16 to 20 foot skiff, the Garmin ECHOMAP UHD2 53CV is among the cleanest single-box purchases. The 5 inch IPS display, the included GT20-TM transducer, and the preloaded Navionics+ inland maps mean one box and one install. If you want forward and down imaging with a slightly larger screen and a higher review count, the Humminbird Helix 5 CHIRP DI G3 is the alternative.
For a pontoon with a seated helm and room on the console, the Garmin ECHOMAP UHD2 93sv or the Humminbird Helix 7 G4. Both give you 7 inches or more and the imaging detail that a split screen needs. The Garmin leans inland with preloaded Navionics+ maps, the Humminbird leans structure fishing with 125 feet of MEGA Side Imaging.
For a small center console running coastal water, chart coverage matters more than screen size. The Lowrance Elite FS has C-MAP Discover preloaded for inland and coastal, full NMEA 2000 and Ethernet for an autopilot or radar later, and a 3-in-1 transducer that avoids running three cables through a small console. The Lowrance HDS PRO goes further with U.S. and Canadian coverage and a SolarMAX HD screen, provided your dash can take 10 inches and 11.6 pounds.
For a boat that is trailered, fished solo, and only ever runs familiar water, the Garmin GPSMAP 78sc is a legitimate primary unit. It floats, it runs 20 hours, and it has preloaded coastal charts. For anyone else, treat it as the backup that lives in the glove box.
Frequently Asked Questions
What is the difference between a GPS plotter and a chartplotter?
A GPS plotter shows your position, speed, and track on a basic map, and it is usually a handheld device. A chartplotter is a fixed-mount multi-function display that overlays that position on detailed electronic charts showing depth contours, hazards, buoys, and shoreline. It also usually accepts a sonar transducer and connects to a VHF, autopilot, or radar over NMEA 2000. For a small boat, a chartplotter gives you far more usable information, and a handheld is better as a backup.
What is the best marine GPS chartplotter for the money?
The Humminbird Helix 5 CHIRP GPS G3 is the strongest all-round value on a small boat. It includes a transom mount transducer, a preloaded basemap covering more than 10000 lakes, AutoChart Live mapping, and physical softkeys that work with wet hands. If you want a larger screen and networking, the Lowrance Elite FS is the step up, and the Garmin ECHOMAP UHD2 53CV is the alternative if IPS screen readability matters most.
Which chartplotter is better, Garmin or Simrad?
Garmin is generally stronger on preloaded mapping and tight, simple units for small boats, with the ECHOMAP UHD2 range bundling Navionics+ inland charts. Simrad is generally better received for C-MAP charting and an intuitive touchscreen interface, and the GO series gets frequent praise for exactly those two reasons in owner discussions. For a small boat specifically, a Garmin unit with included charts often means fewer separate purchases.
Is Raymarine better than Garmin?
Neither is better for every boat. Raymarine units are built for larger, more instrumented boats and tend to appear less often in small boat recommendations. Garmin covers more of the small boat range with preloaded chart bundles and simpler controls. If you are fitting a small open boat, the deciding factors are included charts, transducer in the box, and physical controls, and all of those favor the Garmin units in this roundup.
What is the most affordable chartplotter available?
The Lowrance Eagle is among the most complete units out of the box, because the transducer, bracket, power cable, fuse, and C-MAP U.S. Inland charts covering 17000+ lakes all come in the box. There is nothing to add before it works on inland water. The main compromise is that it has DownScan but no SideScan, and its menu system takes a little practice.
Do I need a chartplotter if I have a phone?
A phone is a reasonable backup, not a replacement. Most boaters run Navionics or Aqua Map alongside a mounted unit for extra detail, but a phone in a waterproof case cannot be trusted in direct sun, has no dedicated GPS antenna in many cases, and dies when your battery dies. On a small boat with limited electrics, a handheld such as the Garmin GPSMAP 78sc is the better second device.
Our Verdict on the Best Marine GPS Chartplotters for Small Boats
After running all ten through the same checks, the Humminbird Helix 5 CHIRP GPS G3 stays our pick as the best marine GPS chartplotter for small boats. It is one of the few units here where the transducer, the mount, the basemap, and the self-survey mapping all arrive in one box, and its softkey controls are the right call on a wet, moving boat. Its 508 reviews are the second largest base in this group, which is the kind of track record you want on electronics that live outdoors.
Pick the Lowrance Elite FS if your dash can take 10 inches and you want SideScan, DownScan, CHIRP from one transducer plus NMEA 2000 and Ethernet for later. Pick the Garmin ECHOMAP UHD2 53CV if a 5 inch IPS screen and preloaded Navionics+ inland maps are the deciding factors. Pick the Lowrance Eagle for a kayak, and keep the Garmin GPSMAP 78sc in the glove box as a floating backup.
Whichever you choose, budget for a mounting arm, a fused power circuit, and chart detail if your water needs more than a basemap. Those three add-ons are where small boat electronics projects usually go over, and sorting them out before you buy keeps the install to an afternoon. Our Raymarine chartplotter guide covers the alternative brand if your boat is already instrumented around it.