Best Marine Gps Units for Small Fishing Boats: Which One to Buy

For most small fishing boats under about 20 feet, a 7-inch combo unit such as the Garmin ECHOMAP UHD2 73sv or the Lowrance HOOK Reveal 7 TripleShot is the best balance of real chart navigation, sonar and cost, while a 5-inch unit suits kayaks, jon boats and tight consoles, and a Garmin STRIKER Vivid is the pick if you only need sonar plus a GPS to mark spots and find your way back to the ramp.

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Marine GPS Units for Small Fishing Boats at a Glance

Most buyers searching for a marine GPS for a small fishing boat actually want a combo: a chartplotter (a GPS with charts) and a fish finder in one housing. Reviewer roundups in 2026, including the NVN Marine and gpsnavigationsite guides, most often name the Garmin ECHOMAP UHD2 7-inch as the all-round pick, Lowrance as the value pick and Humminbird as the imaging pick. The table collects the stated specifications from makers and retailers.

What “Marine GPS” Should Mean for a Small Boat

The phrase covers three different product types, and choosing the wrong type is the most common mistake.

• Chartplotter/fish finder combos show your position on a map with depth contours and hazards, and add sonar. This is what the units above mostly are.
• Fish finders with built-in GPS, like the STRIKER Vivid line, mark waypoints and trails but do not take full navigation charts. Reviewers sum them up as a fish finder with GPS, not a navigation system.
• Handheld or phone-based GPS can serve as a backup. Garmin and Lowrance units pair with phone apps such as ActiveCaptain, but a phone is not a substitute for a waterproof, sunlight-readable display.

If you only fish a familiar lake and never run unfamiliar water, a GPS-equipped fish finder may be enough. If you run big water, fish at dawn or dusk, or cross open water, a real chartplotter with navigation charts is the safer choice. Whichever you choose, treat the electronics as a helper, not a replacement for a paper chart, a compass, a charged VHF radio or phone, lifejackets and local knowledge.

Features That Matter on a Small Boat

Screen size and mounting space

Five-inch units suit kayaks, jon boats and small bass boats where console or bow space is limited, but split-screen views feel cramped. Seven-inch screens are the common sweet spot on 16 to 20 foot boats, because you can show chart and sonar side by side. Check the mounting footprint: the Garmin ECHOMAP UHD2 73sv measures about 8.6 by 5.6 by 3.2 inches and weighs about 2.2 pounds, while the STRIKER Vivid 7sv is listed at 9.3 by 5.5 by 2.3 inches and 1.7 pounds, and the Humminbird Helix 7 G4 is listed at about 10.5 by 5.4 by 3.1 inches. Bail mounts and flush mounts need different amounts of clearance.

Charts and mapping

Garmin ECHOMAP UHD2 units come with Navionics+ inland maps. Lowrance HOOK Reveal bundles come with either C-MAP Contour+ or C-MAP Discover OnBoard cards depending on the model; reviewers describe Contour+ as covering about 24,000 U.S. and Canadian lakes with 1-foot contours. Humminbird includes Basemap and AutoChart Live, which lets you build your own contour maps from your own trips. Garmin’s equivalent is Quickdraw Contours. If you fish coastal waters, confirm that the bundle you buy includes coastal charts, as the inland versions do not.

Sonar and transducer

The transducer is as important as the screen. Garmin sells the ECHOMAP UHD2 with and without a transducer, and the GT54UHD bundle is listed with 800 kHz UHD to about 200 feet and 1200 kHz SideV reaching about 125 feet to each side. Lowrance’s TripleShot adds SideScan to CHIRP and DownScan. The Humminbird Helix 7 MEGA SI includes the XNT 9 HW MSI 150 T transducer, which mounts on the transom. Retail pages differ on maximum depth ratings, so rely on the maker’s spec sheet when depth matters to you.

Power and installation

Most of these units run on 12-volt DC. The Lowrance HOOK Reveal 7 lists a draw of about 1.25 amps at 13 volts with a 5 amp fuse recommended, and the STRIKER Vivid 5cv lists a typical draw of 0.40 amps. On small boats, power usually comes from a dedicated battery or a fused connection to the cranking battery. Use the fuse size and wire gauge in the manual, keep connections dry, and have a qualified marine electrician check the installation if you are unsure. All units mentioned carry an IPX7 splash rating, which means they survive temporary immersion but are not meant to be left under water.

Networking and expansion

If you plan to add a trolling motor, forward-facing sonar or a second display later, networking matters. The Garmin ECHOMAP UHD2 supports NMEA 2000, shares sonar and waypoints wirelessly with another ECHOMAP UHD2, connects wirelessly to a Force trolling motor and is LiveScope-ready. The STRIKER Vivid has no networking and no LiveScope support. Reviewers say the HOOK Reveal is a closed system. The Humminbird G4 does not work with MEGA Live, though the networkable G4N does.

Controls

Keypad units are easy to use with wet or gloved hands and in chop. Touchscreens are faster for panning charts. The ECHOMAP UHD2 73sv offers touch with keyed assist, which is useful in both situations.

Budget, Mid-Range and Premium Tiers

Budget

The Garmin STRIKER Vivid 4cv is picked by reviewers as best for kayaks, and the 5cv and 7sv are called the sweet spot for most users by a reviewer on Sonar Wars. The STRIKER Vivid 5cv lists a 5-inch 800 x 480 display, CHIRP and ClearV sonar, 500 watts RMS transmit power, 5,000 waypoints and a 50,000-point track log. You give up navigation charts, but you get strong sonar for the money. The Lowrance HOOK Reveal 5 is the entry route into a chartplotter combo.

Mid-range

The Lowrance HOOK Reveal 7 TripleShot and Humminbird Helix 7 G4 sit here. The HOOK Reveal 7 is often described as one of the best-value options with a TripleShot transducer and C-MAP Contour+ charts. The Helix 7 is a practical keypad-driven choice for anglers who prefer dependable buttons and value built-in contour mapping.

Premium

The Garmin ECHOMAP UHD2 73sv, 74sv and larger sizes sit at the top of this guide’s range. Above that sits the ECHOMAP Ultra 2 series announced in 2023, with 10-inch and 12-inch models at 1280 x 800 and 10 Hz multi-band GPS, aimed at larger boats and tournament anglers.

Pick This Unit If You Match This Profile

Alternatives

• Lowrance Elite FS 7: a touchscreen unit with Active Imaging 3-in-1 that reviewers recommend for anglers who put fishing ahead of navigation.
• Humminbird Helix 5 G3: a practical small-boat chartplotter with AutoChart Live for users who like keypad controls.
• Garmin ECHOMAP Ultra 2: a step up to larger screens if you outgrow a 7-inch display.

Frequently Asked Questions

Do I need a chartplotter or is a fish finder with GPS enough?

A fish finder with built-in GPS, like the STRIKER Vivid, can mark waypoints and trails but does not take full navigation charts. If you only fish familiar water, it can be enough. If you run unfamiliar water or open water, a chartplotter with navigation charts is the safer choice.

What screen size suits a boat under 20 feet?

Seven inches is the most commonly recommended size for boats between 16 and 20 feet, because it allows split views. Five inches suits kayaks, jon boats and small consoles, but split-screen views feel cramped.

Are the maps included?

It depends on the bundle. Garmin ECHOMAP UHD2 units include Navionics+ inland maps, and Lowrance HOOK Reveal bundles come with C-MAP cards in several versions. Coastal charts are not included in every inland bundle, so confirm the listing before you buy.

Does the unit come with a transducer?

Not always. Garmin sells the ECHOMAP UHD2 73sv both with and without a transducer, and retail listings for head-unit-only models may exclude it. Read the contents of the box before you order.

Can I add a trolling motor or forward-facing sonar later?

On the Garmin ECHOMAP UHD2, yes: it connects wirelessly to a Force trolling motor and supports LiveScope. The STRIKER Vivid has no networking or LiveScope support, and Humminbird G4 models do not work with MEGA Live, though G4N models do.

Will it run off a small boat battery?

These units are designed for 12-volt systems. Power draw is modest, around 0.4 to 1.25 amps in the figures listed above. Follow the manual’s fuse and wiring instructions, and ask a qualified marine electrician if you are unsure.