Marine Electronics for Boats

HELIX is Humminbird's widely used fishfinder range in 5 to 15 inch sizes. XPLORE is the newer touchscreen range in 9, 10 and 12 inch sizes. APEX is the premium range with the largest 13, 16 and 19 inch displays. See our HELIX vs XPLORE vs APEX guide for a full comparison.

Marine stereos and speakers are built for moisture, sun and salt air, with sealed or coated electronics, UV-resistant materials and corrosion-resistant hardware. Car audio is not designed for that exposure and usually fails quickly on a boat. Look for marine-rated stereos, speakers and amplifiers.

Most boats start with a GPS chartplotter or GPS fishfinder combo and a VHF radio. Anglers add a fishfinder transducer that supports the sonar views they want. Boats that run offshore, at night or in fog often add radar, an autopilot and AIS. Start with what you need for safety and navigation, then add fishing electronics.

A fishfinder uses a sonar transducer to show depth, bottom structure and fish below the boat. A chartplotter uses GPS to show your position on marine charts or lake maps. A GPS fishfinder combo does both on one screen, which is why most anglers choose a combo unit.

LakeMaster covers inland lakes and CoastMaster covers coastal waters. Both are made for Humminbird displays. LakeMaster VX Premium adds satellite imagery and shaded relief to the Standard edition. Check that the map card is compatible with your exact Humminbird model before you order.

To choose a fish finder, compare screen size, the sonar views you want (CHIRP 2D, down imaging, side imaging or live sonar), whether it includes GPS maps, and whether a transducer comes in the box. Larger screens are easier to read with split views. Check that the transducer matches your boat and how you plan to mount it.

The transducer must match your display brand and connector and support the sonar views you want. Then pick a mount that suits your boat: transom mount for most trailer boats, in-hull or thru-hull for larger fiberglass boats, or a trolling motor mount. Always check the compatibility list for your exact display model.

Live or forward-facing sonar shows fish, structure and your lure moving in real time in front of or below the boat. Garmin calls it LiveScope, Humminbird calls it MEGA Live and Lowrance calls it ActiveTarget. It needs a dedicated live sonar transducer and a compatible display.

A thermal camera detects heat instead of light, so it shows boats, buoys, people in the water and shorelines in complete darkness, glare or light fog. Many marine thermal cameras connect to a compatible chartplotter display.

A marine autopilot steers the boat to hold a heading or follow a route from your chartplotter, so you can focus on fishing, trimming or watching for traffic. The autopilot drive must match your steering system, such as hydraulic, mechanical or outboard steering.

Radar is not required for most small inland boats, but it is a valuable safety tool if you run at night, in fog or offshore. It shows other boats, land and weather around you, even when you cannot see them. Most radars display on a compatible chartplotter from the same brand.

Many boat owners handle installing marine electronics on their own boat, such as fishfinders, transom mount transducers and VHF radios, using the manufacturer's instructions. Thru-hull transducers, radar, autopilots and networked systems are more involved, and many owners use a marine electronics installer for those. Plan cable runs, power and mounting before you start.

Basic data such as GPS position, depth, heading and engine data can be shared between brands over NMEA 2000. Advanced features such as sonar views, radar, live sonar and some autopilot functions usually work only within the same brand. Check compatibility before mixing brands.