Best Boat Gps Fish Finder: Compare 10 GPS Sonar Units

#1 · Best Overall

1. Simrad GO Chartplotter

• Screen Size: 9 in
• Weight: 3 lb
• Dimensions: 10.35"L x 3.54"W x 7.24"H

Best for: Multifunction boat helm.

Why it ranks #1: Combines a 9-inch touchscreen, built-in high-precision GPS, C-MAP Discover charts and an included HDI transducer for navigation and sonar.

The Simrad GO9 combines a nine-inch touchscreen, GPS navigation, sonar support, and radar capability for sportboats, center-consoles, and smaller cruisers. Its included C-MAP Discover card adds vector charts, custom depth shading, tides and currents, and high-resolution bathymetric contours across the U.S. and Canada.

The nine-inch multi-touch screen supports tap-to-set waypoints, pinch-to-zoom, and chart panning, making chart interaction familiar to smartphone and tablet users. Built-in high-precision GPS works alongside the included C-MAP Discover card, whose features include custom depth shading, tides and currents, and bathymetric contours. The package includes an 83/200 kHz HDI transducer, gimbal bracket, power cable, and suncover. Radar capability and additional chart compatibility support a broader helm-navigation setup.

Skip it if you fish inland and want custom one-foot contours saved across up to two million acres; the Garmin STRIKER Plus 5cv provides that Quickdraw mapping.

A fit for boaters who want chartplotting, sonar, and radar capability on one nine-inch touchscreen. Its C-MAP coverage and included chart card suit U.S. and Canadian navigation, so check that scope against your routes.

Listed on Amazon as: Simrad GO Chartplotter and Fish Finder, with Transducer and Radar Options, Preloaded C-MAP Discover Chart Card

#2 · Best Garmin Screen

2. Garmin Striker Vivid 7cv

• Screen Size: 7 in
• Weight: 4.4 lb
• Dimensions: 11.4"L x 8.9"W x 8.2"H

Best for: Seven-inch scanning sonar.

Why it ranks #2: Pairs a 7-inch display and included GT20-TM transducer with CHIRP and ClearVü sonar, high-sensitivity GPS and Quickdraw Contours.

Garmin’s vivid scanning-sonar color palettes help distinguish fish from structure on a seven-inch color display. The STRIKER Vivid 7cv includes a GT20-TM transducer for CHIRP traditional sonar and CHIRP ClearVü, plus high-sensitivity GPS for marking waypoints, creating routes, and viewing boat speed.

The included GT20-TM transducer supports both CHIRP traditional sonar and CHIRP ClearVü scanning sonar, while the display’s vivid palettes help separate fish and structure visually. Use the built-in GPS to mark waypoints, create routes, or view boat speed; Quickdraw Contours adds onboard mapping. The included tilt/swivel bailmount lets you adjust the viewing angle, and Wi-Fi connectivity supports connection to the ActiveCaptain app with compatible devices.

Skip it if you want MEGA Side Imaging coverage and detailed chart features in a larger-screen unit; the Humminbird XPLORE offers those sonar modes and a 10-inch display.

A fit for boaters who want a seven-inch screen, included scanning-sonar transducer, and GPS route tools in one package. Consider the specific sonar coverage you need before choosing its GT20-TM configuration.

Listed on Amazon as: Garmin Striker Vivid 7cv, U.S. with GT20-TM Transducer – Easy-to-Use 7-inch Color Fishfinder and Sonar Transducer, Vivid Scanning Sonar Color Palettes (010-02552-00)

#3 · Best Side Imaging

3. Humminbird Helix 7 G4

• Screen Size: 7
• Weight: 2.1 lb
• Dimensions: 3.06"L x 10.54"W x 5.44"H

Best for: Side-imaging structure scout.

Why it ranks #3: Includes a transducer, built-in GPS and Humminbird Basemap, with MEGA Side and Down Imaging coverage extending 125 feet.

MEGA Side and Down Imaging show contours and structure up to 125 feet beside and beneath the boat, with three times more detail than standard imaging sonar. The Humminbird HELIX 7 G4 pairs those views with a seven-inch display, Dual Spectrum CHIRP, GPS, and an included transducer.

Use MEGA Side Imaging to survey up to 125 feet to either side and MEGA Down Imaging to inspect directly below; Dual Spectrum CHIRP offers Wide and Narrow search modes for fish and structure. The included transom-mount transducer supports this sonar package, while built-in GPS and Humminbird Basemap add navigation. AutoChart Live and preloaded split-screen views give the seven-inch display mapping and sonar information to present together.

Skip it if you need imaging coverage up to 200 feet on each side and a 10-inch touchscreen; the Humminbird XPLORE provides both, but requires a separate transducer.

A strong option for anglers who want broad side-and-down imaging, CHIRP, and GPS on a seven-inch display. Consider its 125-foot imaging coverage and screen size against the water and viewing area you need.

Listed on Amazon as: Humminbird Helix 7 G4 GPS Fish Finder with Transducer, MEGA Side Imaging

#4 · Largest Display

4. Humminbird XPLORE

• Screen Size: 10 in
• Weight: 4.8 lb
• Dimensions: 12.1"L x 3.3"W x 7.25"H

Best for: Large-screen mapping specialist.

Why it ranks #4: Its 10-inch touchscreen, built-in GPS and included LakeMaster and CoastMaster VX chart card suit anglers seeking extensive mapping and imaging.

MEGA Side Imaging+ scans up to 200 feet on each side, giving anglers broad underwater coverage from a 10-inch HD touchscreen. Humminbird’s XPLORE adds MEGA Down Imaging+ with 200-foot depth coverage, Dual Spectrum CHIRP, built-in GPS, and an included LakeMaster and CoastMaster VX map card.

Use Side Imaging+ to survey up to 200 feet on either side and Down Imaging+ for coverage to 200 feet beneath the boat; Dual Spectrum CHIRP adds a traditional sonar view. The included map card and Basemap covering more than 10,000 lakes and coastal waters support navigation, while the touchscreen and One-Boat App waypoint syncing help organize up to 10,000 spots. This is a control-head-only model, so a compatible transducer must be obtained separately.

Skip it if you need a transducer in the box for a ready-to-install sonar setup; the Humminbird HELIX 7 G4 includes a transom-mount transducer.

Best suited to anglers seeking a large touchscreen, wide imaging coverage, and extensive charting and waypoint tools. Factor in the separate transducer purchase and installation before choosing this control-head-only configuration.

Listed on Amazon as: Humminbird XPLORE Series GPS Fish Finder MEGA Side Imaging+ & HD Touchscreen Display

#5 · Best Inland Mapping

5. Lowrance HOOK Reveal 5

• Screen Size: 5 in
• Weight: 14.4 oz
• Dimensions: 9.02"L x 7.13"W x 7.52"H

Best for: Inland FishReveal mapper.

Why it ranks #5: Combines a 5-inch display and SplitShot transducer with FishReveal, preloaded C-MAP inland maps for almost 4,000 lakes and Genesis Live.

FishReveal combines Lowrance CHIRP target separation with DownScan structure images, helping fish show more clearly against underwater detail. The HOOK Reveal 5 pairs that view with a five-inch display, SplitShot transducer, and preloaded C-MAP coverage for almost 4,000 U.S. inland lakes.

FishReveal layers CHIRP sonar and DownScan Imaging to help distinguish fish from structure on the display. The included SplitShot Skimmer Transducer supports the sonar setup, while preloaded C-MAP inland mapping covers almost 4,000 U.S. lakes. Genesis Live lets you create custom contour maps over a map or GPS plotter, adding detail for future navigation. A mounting bracket and power cable are included, making the package suitable for a fixed boat installation.

Skip it if you need wide-area coastal chart coverage and radar capability alongside sonar; the Simrad GO9 combines a nine-inch display with C-MAP Discover charts and radar support.

Well suited to inland anglers who want FishReveal sonar and lake mapping with the ability to add custom contours. Its preloaded mapping is inland-focused, so consider your regular waters and screen-size needs.

Listed on Amazon as: Lowrance HOOK Reveal 5 SplitShot – 5-inch Fish Finder with SplitShot Transducer, Preloaded C-MAP US Inland Mapping

#6

6. Humminbird HELIX 5

• Screen Size: 5
• Weight: 2.1 lb
• Dimensions: 4.64"L x 3.3"W x 7.55"H

Best for: Lake-charting sonar navigator.

Why it ranks #6: Offers a 5-inch color display, Dual Spectrum CHIRP, built-in Basemap covering 10,000-plus lakes and U.S. coastlines, and an included transducer.

Dual Spectrum CHIRP offers Wide Mode for broader searching and Narrow Mode for detailed scanning, letting you adjust how you inspect fish and structure. The Humminbird HELIX 5 pairs that sonar with a five-inch color display and built-in Basemap coverage of more than 10,000 lakes and continental U.S. coastlines.

Use Wide Mode when you want maximum sonar coverage, then switch to Narrow Mode to examine fish-holding structure in more detail; Low-Q transducer technology supports precise 2D target separation. The included transom-mount transducer and gimbal bracket make this a complete control-head-and-mount package. Built-in Humminbird Basemap adds extensive lake and coastline coverage, while compatibility with LakeMaster, CoastMaster, and Navionics charts gives chart users additional options.

Skip it if you want a larger touchscreen and included LakeMaster and CoastMaster VX map card; the Humminbird XPLORE offers a 10-inch display.

A strong match for anglers who want adjustable CHIRP search modes and built-in coverage across many lakes and U.S. coastlines. Its five-inch display is the key fit consideration if you regularly view charts and sonar together.

Listed on Amazon as: Humminbird 411660-1 Helix 5 Chirp GPS G3 Fish Finder

#7

7. Garmin STRIKER 5CV

• Screen Size: 5 in
• Weight: 16 oz
• Dimensions: 7.4"L x 2.1"W x 4.5"H

Best for: Custom contour map maker.

Why it ranks #7: Provides a 5-inch sunlight-readable display, GPS, CHIRP and ClearVü sonar, Quickdraw Contours, and a CV20-TM transducer.

Garmin Quickdraw Contours lets you create and store maps with one-foot contours across up to two million acres, turning your own time on the water into detailed fishing maps. The STRIKER Plus 5cv combines that mapping with a five-inch sunlight-readable display, built-in GPS, and included transducer.

Use Quickdraw Contours to create detailed maps of familiar waters, while built-in GPS lets you mark waypoints, create routes, and view boat speed. The included CV20-TM transducer supports CHIRP traditional sonar and CHIRP ClearVü scanning sonar, so mapping and fish-finding are available in one unit. Its sunlight-readable five-inch display and tilt/swivel mount support adjustable viewing, and the package also includes transom and trolling-motor mounts.

Skip it if you want MEGA Side Imaging and a seven-inch screen for surveying beside the boat; the Humminbird HELIX 7 G4 includes both.

A practical choice for anglers who want to map their own waters and save routes alongside traditional and scanning sonar. The five-inch screen suits compact helm setups, but buyers prioritizing a wider view should consider a larger display.

Listed on Amazon as: Garmin 010-01872-00 STRIKER 5CV with Transducer, 5" GPS Fishfinder, CHIRP Traditional And ClearVu Scanning Sonar Transducer, Built In Quickdraw Contours Mapping Software

#8

8. Garmin STRIKER 4

• Screen Size: 3.5 in
• Weight: 8 oz
• Dimensions: 3.6"L x 1.6"W x 5.9"H

Best for: Compact GPS waypoint finder.

Why it ranks #8: A compact 3.5-inch color GPS fish finder with a transducer, waypoint marking and navigation back to fishing spots, docks and ramps.

Built-in high-sensitivity GPS lets the Garmin STRIKER 4 mark favorite fishing spots, docks, and ramps so you can navigate back to them. Its 3.5-inch color display keeps the unit compact, while the included transducer supports finding fish and saving useful locations for another trip.

The included transducer and color fishfinder give you a ready-to-mount sonar setup, with a tilt/swivel mount and transom and motor mounts included. Built-in GPS adds a practical second task: mark a productive spot, boat ramp, or dock, then return to it. At 3.5 inches, the display suits buyers who value a compact unit over a larger viewing area. STRIKER users can also share favorite waypoints and routes with other STRIKER units.

Skip it if you need a wider screen for viewing sonar and navigation together; the Humminbird HELIX 5 offers a 5-inch display.

A good fit for anglers who want a compact GPS fishfinder to mark and revisit spots, docks, and ramps. Choose another unit if a larger screen is important for reading sonar information from your usual boating position.

Listed on Amazon as: Garmin 010-01550-00 Striker 4 with Transducer, 3.5" GPS Fishfinder with Chirp

#9

9. Garmin STRIKER Plus 4

• Screen Size: 4.3 in
• Weight: 11.2 oz
• Dimensions: 9.09"L x 6.96"W x 5.03"H

Best for: Compact contour mapping.

Why it ranks #9: Includes a dual-beam transducer, built-in GPS and Quickdraw Contours, but its 4.3-inch display is smaller than several ranked alternatives.

Garmin Quickdraw Contours lets the STRIKER Plus 4 create and store maps with one-foot contours across up to two million acres. Its 4.3-inch sunlight-readable display, built-in GPS, and included dual-beam transducer bring mapping, waypoint navigation, and CHIRP sonar to a compact fishfinder.

The dual-beam transducer supports Garmin CHIRP traditional sonar, while built-in GPS lets you mark and navigate to waypoints and view boat speed. Quickdraw Contours can create and store maps with one-foot contours, giving anglers a way to chart familiar waters. The 4.3-inch sunlight-readable display keeps the viewing footprint modest, and the package includes transom and trolling-motor mounts, a tilt/swivel mount, and power/data cable for installation.

Skip it if you need CHIRP ClearVü scanning sonar and a five-inch screen; the Garmin STRIKER Plus 5cv includes both with Quickdraw Contours mapping.

A good match for anglers who want GPS, CHIRP sonar, and self-made contour maps in a compact unit. The 4.3-inch display is the main fit consideration if you need more room to view sonar and mapping.

Listed on Amazon as: Garmin 010-01870-00 Striker Plus 4 with Dual-Beam transducer

#10

10. Garmin STRIKER Vivid 4cv

• Screen Size: 4 in
• Weight: 11.2 oz
• Dimensions: 1.8"L x 3.9"W x 6.9"H

Best for: Compact vivid sonar finder.

Why it ranks #10: Includes GPS, Quickdraw Contours and a GT20-TM transducer with CHIRP and ClearVü, though its 4-inch screen limits chart and sonar viewing space.

Garmin’s vivid scanning-sonar palettes help distinguish fish and structure on the STRIKER Vivid 4cv’s four-inch color display. Its included GT20-TM transducer supports CHIRP traditional sonar and CHIRP ClearVü, while high-sensitivity GPS lets you mark waypoints, create routes, and view boat speed.

The GT20-TM transducer supports both traditional CHIRP sonar and ClearVü scanning sonar, while vivid color palettes help separate fish from structure on the display. Built-in GPS adds waypoint marking, route creation, and boat-speed viewing, and Quickdraw Contours supplies mapping. The included tilt/swivel mount lets you adjust the viewing angle. At four inches, the screen keeps the unit compact, though it offers less room for sonar and navigation than larger displays.

Skip it if you want a seven-inch display with the same GT20-TM sonar package and GPS mapping; the Garmin STRIKER Vivid 7cv offers that larger screen.

A fit for anglers seeking a compact color unit with scanning sonar, GPS, and Quickdraw mapping. The four-inch screen is the boundary to weigh if you want a larger view for reading sonar and navigation.

Listed on Amazon as: Garmin STRIKER Vivid 4cv, Easy-to-Use 4-inch Color Fishfinder and Sonar Transducer, Vivid Scanning Sonar Color Palettes