Best Fish Finder and GPS for Pontoon Boats: See What’s Beneath & Navigate With Confidence
Introduction
You’re idling across the lake, staring at a featureless blue screen, wondering if the fish are hiding somewhere beneath you—or if you’re just drifting over an empty desert of mud and disappointment.
TL;DR
A fish finder with GPS isn’t just for hardcore anglers anymore. Even casual pontoon owners use these tools to navigate safely, find deep swimming holes, mark hidden hazards, and—yes—actually catch fish. Modern units combine CHIRP sonar, Down Imaging, GPS mapping, and even Side Scanning into affordable, easy-to-use displays. Whether you’re tricking out a Bennington fishing model, adding tech to a family Avalon, or upgrading a luxury Barletta, the right fish finder transforms how you use your boat. This guide breaks down sonar types, screen sizes, brand recommendations, and installation tips so you can choose the perfect unit for your pontoon and your budget.
Key Takeaways
- Sonar Technology Matters: CHIRP sonar gives you clearer, sharper images than old-school single-frequency sonar. Down Imaging shows you structure and fish with photo-like detail.
- GPS Is a Safety Feature: Marking waypoints, tracking your route, and seeing your location on a map helps you navigate unfamiliar water and find your way back in low visibility.
- Screen Size = Usability: A 5-inch screen is the minimum for most adults. 7 to 9 inches is the sweet spot for pontoons where you’re sitting farther from the dash.
- You Don’t Need Side Scan (Probably): Side Imaging is amazing for finding structure way off to the sides of your boat, but most pontoon owners do fine with Down Imaging and CHIRP.
- Brands Integrate Differently: Garmin, Humminbird, and Lowrance each have loyal followings. Your choice may depend on whether you want to integrate with trolling motors (Minn Kota pairs with Humminbird; Garmin has its own trolling motors).
The Day I Realized I Was Fishing Blind
I’d been fishing my whole life. Growing up, we had a simple flasher—a green blip that told you there was something down there, maybe. When I bought my first pontoon, a used Avalon with no electronics, I figured I’d just fish the way my grandpa did: look for birds, watch for bait jumping, and cast where it “looks fishy.”
I caught fish. But not many. And I spent a lot of time motoring around, burning gas, staring at empty water.
*”A buddy with a *Bennington* fish model invited me out one morning. He punched up a waypoint on his Garmin, idled over a submerged brush pile 30 feet down, and said ‘There they are.’ His screen showed arches—real, identifiable fish—hovering over the structure. We caught a dozen crappie in an hour. I ordered a fish finder that night.”*
The technology has gotten cheaper and easier. Here’s what you need to know.
Sonar Technology: What All Those Terms Actually Mean
If you’ve looked at fish finders online, you’ve seen alphabet soup: CHIRP, Down Imaging, Side Scan, Traditional Sonar. Here’s the plain-English breakdown.
Traditional Sonar (2D Sonar)
This is the basic stuff. The transducer sends out a single frequency (like 200 kHz) and listens for echoes. It shows you the bottom, depth, and returns that look like “arches” for fish.
- Pros: Works well, cheap, easy to read.
- Cons: Doesn’t show much detail. A fish and a bush can look the same.
- Best For: Budget units and basic depth finding.
CHIRP Sonar
Instead of one frequency, CHIRP sweeps through a range of frequencies (like 40-240 kHz) constantly. This gives you much sharper images with better target separation.
- Pros: Clearer arches, less clutter, better at showing fish close to the bottom.
- Cons: Slightly more expensive than traditional sonar.
- Best For: Anyone who actually wants to identify fish, not just see blobs.
Down Imaging (DownScan)
This uses a different technology—basically a “picture” of what’s directly under your boat. It shows structure (rocks, trees, brush piles) in photo-like detail.
- Pros: Incredible detail. You can see individual branches of a sunken tree.
- Cons: Fish don’t show as “arches”—they look like bright spots or white blobs.
- Best For: Finding structure and cover where fish hide.
Side Imaging (SideScan)
This shows you what’s off to the left and right of your boat, sometimes hundreds of feet in each direction.
- Pros: Covers huge areas quickly. Finds isolated structure you’d otherwise miss.
- Cons: Expensive. Requires a larger screen (9 inches or bigger) to see detail. Overkill for many pontoon owners.
- Best For: Serious anglers searching large lakes for hidden structure.
Real-Time (Live) Sonar
The newest tech—shows fish moving in real-time, like a video game. Brands call it LiveScope (Garmin), Mega Live (Humminbird), or ActiveTarget (Lowrance).
- Pros: Mind-blowing. Watch fish react to your lure.
- Cons: Very expensive ($1,500+ just for the transducer). Requires fast processor and large screen.
- Best For: Dedicated anglers with big budgets.
*”Here’s a tip I learned from a seasoned captain: For 90% of pontoon owners, a unit with *CHIRP* and Down Imaging is the sweet spot. You get clear fish arches AND detailed structure views without breaking the bank.”*
GPS and Mapping: More Than Just a Arrow on a Blue Screen
A fish finder without GPS is just a depth finder. Adding GPS turns it into a navigation tool that makes you safer and more effective.
What GPS Adds:
- Waypoints: Mark spots where you caught fish, found a hazard, or anchored. Name them (“Crappie Hole,” “Stump Field,” “Swim Cove”). The unit remembers exactly where they are.
- Routes: Track where you’ve been. Follow the same path back in fog or darkness.
- Speed Over Ground: Your boat speed displayed accurately (paddle wheel speedos are often wrong).
- Lake Maps (Chartplotting): Many units come with preloaded lake maps showing depth contours, underwater features, and hazards.
Mapping Terminology:
- Basemap: Basic map that comes with the unit. Shows shoreline and major depth contours.
- Navionics or LakeMaster: Premium map cards you buy separately. They show incredibly detailed 1-foot depth contours, underwater vegetation, and even “community edits” where other boaters have marked hazards.
- Quick Draw Contours: Some units let you create your own high-detail maps as you drive. Useful for lakes that don’t have good maps available.
Why This Matters for Pontoons:
Pontoons run in shallow water more than most boats. You’ll be fishing in 8-15 feet, beaching on sandbars, and navigating channels. A GPS with good lake maps shows you exactly where the channel drops off, where the submerged rocks are, and how to get back to the ramp when the sun goes down.
“Safety reminder: GPS is a tool, not a substitute for paying attention. Batteries die, satellites lose signal, and maps can be wrong. Always keep your eyes on the water and know how to navigate with landmarks and paper maps as backup.”
Screen Size: Bigger Is (Usually) Better
This is the #1 regret people have after buying a fish finder: they wish they’d gotten a bigger screen.
The Sizes:
- 4 to 5 inches: Small. Works fine for basic depth and simple mapping. Hard to see split-screen (map + sonar) from a helm seat. Good for kayaks or secondary units.
- 7 inches: The sweet spot for most pontoons. You can run split-screen (map on one side, sonar on the other) and still read everything from a few feet away.
- 9 to 10 inches: Luxury. Great for older eyes or if you want to run Side Imaging. Easy to read from anywhere at the helm.
- 12+ inches: Big boat territory. Probably overkill for a pontoon unless you’re a serious angler with live sonar.
Mounting Matters:
Pontoons often have you sitting farther from the dash than a bass boat. Consider a RAM mount or other adjustable mount that lets you tilt and swivel the screen toward your face.
Matching Fish Finders to Your Pontoon Brand
Different pontoon brands have different helm layouts, factory options, and common setups. Here’s what works best for each.
Bennington
Bennington offers factory fish finder packages, often with Garmin units (like the Striker or Echomap series) flush-mounted in the dash. The helm area on Benningtons is generally spacious, with room for a 7- or 9-inch screen. Look for Bennington’s “Fish Package” which includes pre-wired transducer mounting and a dedicated battery for electronics. Many Bennington fish models come with Garmin 52CV or 72SV units from the factory .
Manitou
Manitou’s sporty, performance-oriented pontoons often appeal to anglers who want speed and handling. For Manitou owners, Humminbird units (like the Helix series) pair well with Minn Kota trolling motors if you’re adding spot-lock capabilities. The helm on Manitous is usually open and accessible, making aftermarket installation straightforward.
Barletta
Barletta focuses on luxury, and their factory electronics tend to be premium. The Barletta Aria and other models often come with Lowrance Hook series fish finders (like the Hook 5 or Hook 4) from the factory . If you’re upgrading a Barletta, look for a unit with a sleek, flush-mountable design that matches the boat’s upscale aesthetic. Barletta owners often appreciate touchscreen models like the Garmin Echomap Ultra series.
Avalon
Avalon builds versatile, family-friendly pontoons that often fish as well as they cruise. Avalon frequently uses Garmin units from the factory—the Venture 85 comes with a Garmin 52CV, and the Catalina Entertainer upgrades to a Garmin 73VC . For Avalon owners, the Garmin Striker Vivid series is a natural fit because it shares the same interface as factory units. Avalon’s fishing-focused models (like the Catalina Rear Fish) come pre-rigged for electronics .
Comparison Table: Best Fish Finders and GPS for Pontoons
| Product/Model | Screen Size | Key Sonar Features | GPS/Mapping | Approx. Cost | Best For |
|---|---|---|---|---|---|
| Garmin Striker Vivid 4cv | 4.3″ | CHIRP, ClearVü (Down Imaging), vivid color palettes | GPS with waypoint mapping (no preloaded lake maps) | $200 – $250 | Budget-conscious owners; small pontoons; basic fishing |
| Garmin Striker Vivid 7sv | 7″ | CHIRP, ClearVü, SideVü (Side Imaging) | GPS with waypoint mapping, Quick Draw Contours (create your own maps) | $500 – $600 | Anglers wanting Side Imaging on a budget; larger screen |
| Humminbird Helix 5 CHIRP GPS G3 | 5″ | Dual Spectrum CHIRP, optional Down Imaging | Internal GPS, Humminbird Basemap (10,000+ lakes), Navionics compatible | $250 – $350 | Entry-level GPS/sonar; smaller helms |
| Humminbird Helix 7 CHIRP SI GPS G4 | 7″ | Dual Spectrum CHIRP, Side Imaging (800ft range), Down Imaging | Internal GPS, Basemap, LakeMaster and Navionics compatible | $600 – $700 | Serious anglers wanting Side Imaging; Minn Kota trolling motor integration |
| Lowrance Hook Reveal 7 | 7″ | CHIRP, DownScan Imaging, FishReveal (combines sonar and downscan) | Internal GPS, C-MAP contour maps (1-foot contours on 8,000+ lakes) | $400 – $550 | Owners wanting easy-to-read FishReveal feature; good value |
| Raymarine Element 7 HV | 7″ | HyperVision 1.2MHz sonar, DownVision, SideVision | Internal GPS, LightHouse charts, RealBathy (create your own maps) | $600 – $800 | Tech-savvy owners wanting 3D-like imaging; quad-core processor for speed |
| Garmin Echomap UHD2 93sv | 9″ | CHIRP, ClearVü, SideVü, LiveScope compatible | Premium worldwide basemap, Navionics+, wireless sharing | $900 – $1,100 | Serious anglers planning to add LiveScope later; luxury pontoons |
Transducer Mounting on a Pontoon: The Tricky Part
Here’s where pontoon boats are different. You can’t just stick a transducer on the transom like a bass boat. Pontoons have… well, pontoons in the way.
Mounting Options:
1. Between the Toons (Best Option)
If you have a dual- or triple-toon pontoon, the space between the tubes is ideal. You can mount a transducer bracket to the cross-members or to an aluminum plate bolted between the toons.
- Pros: Clean installation, protected from impact, reads accurately at speed.
- Cons: Requires getting under the boat (on a trailer or lift). More complex installation.
2. On the Back of a Pontoon Tube
You can mount the transducer to the transom area of one of the rear pontoon tubes. This is common on fishing models.
- Pros: Simple, easy to access.
- Cons: Can be damaged when beaching or loading on trailer. May read poorly in sharp turns.
3. Trolling Motor Mount
Many pontoon anglers mount the transducer directly to their trolling motor. The transducer moves with the motor, showing you exactly what’s in front of where you’re casting.
- Pros: Excellent for shallow-water fishing. Sees where you’re going, not where you’ve been.
- Cons: Only works when trolling motor is deployed. Transducer can be damaged if you hit something.
4. Through-Hull (No-Drill)
Some transducers can shoot through the hull (solid fiberglass only—not aluminum pontoons). For aluminum pontoons, you can glue the transducer inside using a shoot-through-hull epoxy kit, but performance varies.
- Pros: No external mounting. Protected from damage.
- Cons: Requires solid hull (not aluminum). May lose some sensitivity.
*”Pro Tip: On most *Bennington*, *Manitou*, *Barletta*, and *Avalon* pontoons, the best spot is between the toons, mounted to a cross-member with a transducer mounting plate (a piece of starboard or aluminum). This keeps it out of harm’s way and reads clean water.”*
Real-World Impact: How a Fish Finder Transforms Your Boating
Scenario 1: The Family Fishing Trip
You’re on your Avalon with the kids. They’re getting bored because no one is catching anything. You glance at your Garmin Striker Vivid 7sv and see a school of arches holding tight to a submerged brush pile 20 feet down. You motor over, drop your lines, and within minutes, the kids are reeling in crappie. They’re hooked (pun intended) for life.
Without a fish finder: You drift aimlessly, hoping. The kids get bored. You head in early.
Scenario 2: The Foggy Morning Return
You launched early to beat the heat. Now it’s 9 AM, and a thick fog has rolled in, reducing visibility to 50 feet. Your Humminbird Helix 7 shows your exact position on the lake map, and you follow the “breadcrumb trail” of your route back to the ramp. You navigate by GPS, not by sight, and tie up safely.
Without GPS: You’re blind. You creep along, listening for other boats, praying you don’t hit a submerged rock or another boater.
Scenario 3: Finding New Water
You’re on your Bennington at a lake you’ve never fished before. Your Lowrance Hook Reveal 7 shows the lake map with 1-foot contours. You spot a sharp drop-off from 10 to 25 feet—classic walleye structure. You mark a waypoint, fish the edge, and catch your limit.
Without mapping: You’re guessing. You fish the same shoreline as everyone else and wonder why the locals are catching all the fish.
Sonar Technology Popularity Among Pontoon Anglers
Here’s how pontoon owners who fish rate different sonar technologies as “essential” versus “nice to have.”
Installation: DIY or Pro?
DIY-Friendly (Most Pontoon Owners Can Do This):
- Mounting a transducer between the toons using a bracket and self-tapping screws.
- Running the transducer cable to the helm (zip ties and wire loom are your friends).
- Mounting the display unit on a RAM mount or flush mount.
- Connecting to a 12V power source (fuse panel or direct to battery with inline fuse).
When to Call a Pro:
- Drilling through the hull (don’t do this on a pontoon tube unless you really know what you’re doing).
- Integrating with NMEA 2000 network to share engine data (RPM, fuel flow) on your fish finder.
- Flush-mounting a large screen into a fiberglass helm console.
Power Considerations:
Fish finders draw very little power—typically 0.2 to 0.5 amps. You can run them off your starting battery without issues. However, if you add a trolling motor or live sonar, consider a second battery.
“Safety reminder: Always install an inline fuse (1-3 amp) on the positive lead of your fish finder. A short circuit can fry your unit or start a fire.”
Network and Integration: The Next Level
If you want to get fancy, modern fish finders can talk to other devices on your boat.
NMEA 2000:
A networking standard that lets different brands’ electronics share data. Your fish finder can display:
- Engine RPM, temperature, fuel flow, and trim position.
- GPS position from your VHF radio (for DSC distress calls).
- Autopilot waypoints.
Trolling Motor Integration:
- Minn Kota + Humminbird: The most common pairing. Your Humminbird fish finder can control your Minn Kota trolling motor (spot-lock, heading, route following).
- Garmin + Garmin: Garmin’s trolling motors integrate seamlessly with their fish finders.
- Lowrance + MotorGuide: Lowrance pairs with MotorGuide trolling motors.
If you plan to add a trolling motor later, buy a fish finder that will integrate with it.
FAQ Section
1. Do I really need a fish finder if I don’t fish much?
Yes—for the GPS alone. Even casual cruisers benefit from knowing depth, marking hazards, and finding their way back in low visibility. Many pontoon owners buy a fish finder primarily for navigation and use the sonar as a bonus.
2. What’s the difference between CHIRP and traditional sonar?
Traditional sonar uses one frequency (like 200 kHz). CHIRP sweeps through a range of frequencies (like 40-240 kHz). CHIRP gives you much sharper images, better target separation, and less clutter. It’s worth the upgrade.
3. Can I use a fish finder on a pontoon without drilling holes?
Yes. Use a portable fish finder (like the Garmin Striker 4 Portable Kit) that comes with a suction cup transducer mount and a battery pack. Or mount the transducer to your trolling motor. Or use a shoot-through-hull epoxy mount (if your pontoon has a solid fiberglass area—most aluminum pontoons don’t).
4. How big of a screen do I need on a pontoon?
5 inches is the absolute minimum. 7 inches is the sweet spot for most people. 9 inches or larger is great for older eyes, Side Imaging, or if you sit far from the dash. The biggest regret buyers have is not going bigger.
5. What’s the best fish finder brand for pontoons?
Garmin, Humminbird, and Lowrance all make excellent units. Garmin is popular for its intuitive interface and the Striker series’ value. Humminbird is the choice if you have a Minn Kota trolling motor. Lowrance offers great mapping with C-MAP. Any of them will serve you well.
6. Do I need Side Imaging on a pontoon?
Probably not. Side Imaging is amazing for finding isolated structure, but it’s expensive and requires a larger screen to be useful. Most pontoon anglers do fine with CHIRP and Down Imaging—you’ll see what’s under and slightly ahead of the boat, which covers 90% of fishing situations.
7. Can I connect my fish finder to my phone?
Many modern units have WiFi or Bluetooth. You can use an app (like Garmin ActiveCaptain, Humminbird FishSmart, or Lowrance Link) to view your fish finder screen on your phone, download waypoints, and update software. Some units even let you control the fish finder from your phone.
References & Further Reading
- Garmin: Marine Electronics Buyer’s Guide – Detailed explanations of sonar technologies and product comparisons.
- Humminbird: Sonar 101 – Educational resources on how sonar works and how to read your screen.
- Lowrance: Fish Finders Explained – Guides to CHIRP, DownScan, and SideScan technologies.
- Navionics: Chart Viewer – Preview lake maps before you buy.
- U.S. Coast Guard: GPS and Navigation Safety – Best practices for using GPS as a navigation tool.
A fish finder with GPS is one of those upgrades that seems like a luxury until you have it—then you can’t imagine being on the water without it. Whether you’re a serious angler chasing trophy bass or a weekend cruiser who just wants to know how deep the water is before you anchor, the right unit makes every trip better, safer, and more productive.
What’s on your wishlist? Are you team Garmin, Humminbird, or Lowrance? Drop a comment below and share what you’re running on your Bennington, Manitou, Barletta, or Avalon—we’d love to hear your fish finder stories!
