Why Fish Finder Choice Matters on Small Boats
On a small boat — whether it's a jon boat, aluminum fishing boat, kayak, or center console under 20 feet — space is limited and every piece of gear needs to earn its place. The right fish finder gives you real-time depth, water temperature, bottom structure, and fish location, dramatically improving your time on the water. The wrong one wastes money and clutters your helm.
This guide covers everything you need to know to choose the best fish finder for a small boat, with picks across every budget and use case.
Fish Finder vs. Combo Unit: Which Do You Need?
Before diving into features, decide whether you want a dedicated fish finder or a GPS/chartplotter combo.
- Fish finder only: Focused on sonar — depth, structure, and fish. More affordable, simpler to use. Best for anglers who already have GPS or fish familiar water.
- GPS/Fishfinder combo: Combines navigation charts with sonar in one unit. Ideal for anglers who fish new water, need to mark waypoints, or want to reduce the number of devices at the helm.
For most small boat anglers, a combo unit offers the best value — one screen, one power connection, one mount.
Key Features to Understand
Sonar Technology
- Traditional 2D sonar: The classic fish arch display. Shows depth, bottom hardness, and fish returns. Simple and effective for most freshwater and inshore fishing.
- CHIRP sonar: Transmits a range of frequencies simultaneously for sharper, more detailed returns. Significantly better target separation than traditional sonar. Worth the upgrade for serious anglers.
- Down Imaging (DI): A narrow, high-frequency beam that produces a near-photographic image of what's directly below the boat. Excellent for identifying structure, brush piles, and suspended fish.
- Side Imaging (SI): Scans a wide swath on both sides of the boat — up to 200 feet per side on some units. Game-changing for covering water quickly and finding structure.
Transducer
The transducer is the underwater sensor that sends and receives sonar signals. It's just as important as the display unit. Key considerations:
- Transom mount: The most common for small boats. Easy to install, works well at low to moderate speeds.
- Trolling motor mount: Attaches to the trolling motor shaft. Keeps the transducer in the water when the main motor is trimmed up.
- Thru-hull: Permanent installation through the hull. Best performance but requires drilling.
- Frequency: Lower frequencies (50 kHz) penetrate deeper; higher frequencies (200 kHz) give better detail in shallow water. CHIRP units handle this automatically.
Screen Size & Visibility
For small boats, a 5–7 inch screen is typically the sweet spot — large enough to read clearly, small enough to mount without dominating the helm. Look for screens rated at 800+ nits for readability in direct sunlight.
GPS & Mapping
If you choose a combo unit, check what maps are included and what additional coverage costs. Major platforms:
- Navionics: Excellent freshwater and coastal coverage. Community-sourced depth maps are a standout feature for inland lakes.
- LakeMaster (Humminbird): Best-in-class detail for freshwater lakes in the US. Highly recommended for bass and walleye anglers.
- C-MAP: Strong coastal and offshore coverage.
Networking
If you plan to add more electronics later, look for units with NMEA 2000 or the manufacturer's proprietary networking (Garmin's Panoptix, Humminbird's Ethernet, Lowrance's Ethernet). This lets units share GPS, sonar, and autopilot data.
Our Fish Finder Picks at Egret Marine
Best for Serious Anglers: Furuno FCV600 & FCV800 CHIRP Fish Finders
Furuno's FCV series represents professional-grade sonar in a compact package. The FCV600 and FCV800 feature true CHIRP sonar with exceptional target separation and depth penetration — trusted by commercial fishermen and serious sport anglers alike. If you want the clearest picture of what's below your boat, Furuno delivers.
Best Budget Pick: HawkEye FishTrax 1C
The HawkEye FishTrax 1C is an excellent entry-level fish finder with an HD color display, fish depth indicators, and water temperature. Compact and easy to install, it's a great first fish finder for anglers on a budget or those new to sonar.
Best Wireless Option: HawkEye FishPod 5X Bluetooth Fishfinder
The HawkEye FishPod 5X pairs with your smartphone via Bluetooth — no permanent installation required. Cast the transducer out or attach it to a kayak for instant sonar readings on your phone. Perfect for kayak anglers or anyone who wants a no-drill solution.
Best Combo Unit: Furuno TZT10X Chartplotter/Fishfinder
For anglers who want navigation and sonar in one premium package, the Furuno TZT10X delivers a stunning 10" display with RealVision 3D sonar, built-in charts, and full networking capability. A serious upgrade for any small to mid-size boat.
Fish Finder Buying Checklist
- ✅ Decided between fish finder only vs. GPS combo
- ✅ Screen size appropriate for your helm space (5–7" for small boats)
- ✅ CHIRP sonar for best target separation
- ✅ Transducer type matches your mounting situation
- ✅ Mapping platform covers your fishing waters
- ✅ Sunlight-readable display (800+ nits)
- ✅ NMEA 2000 networking if you plan to expand
Installation Tips for Small Boats
- Mount the display at eye level and within easy reach of the helm.
- Keep transducer cables away from bilge pumps and other electrical sources to reduce interference.
- On aluminum boats, use a transducer shoot-thru-hull kit or in-hull mount to avoid drilling.
- Use marine-grade heat-shrink connectors on all wiring — corrosion is the enemy.
Shop Fish Finders at Egret Marine
Browse our full selection of Fish Finders and GPS/Fishfinder Combos from Furuno, HawkEye, Raymarine, and more.
Have questions about which unit is right for your boat and fishing style? Contact our team — we're anglers too.