Garmin 25M Camera Coax Cable | GC 245 & GC 255

When you're mounting a Garmin marine camera a long way from your display, the cable that comes in the box only gets you so far. That's what this is for. The 25M Camera Coax Cable is a straight video extension for the GC 245 surface-mount and GC 255 flush-mount cameras, and it gives you 25 meters, right around 82 feet, of clean signal run.

Think about where these cameras actually go. A transom camera watching your outboards. An engine room camera down below. A spreader or hardtop camera looking back over the cockpit. On a bigger boat, the helm and the camera can be a long way apart, and the stock cable just won't reach. Rather than splice or daisy-chain something questionable, you run one continuous factory coax from the camera to the display. One cable, two sealed ends, done.

It's a pure length variant. Same cable as the 15M version, just longer. So if you measured your run and came up past what 15 meters gives you, this is the one. And because it's a single continuous coax, you're not adding connection points where water and corrosion like to sneak in. Every extra plug in a marine wiring run is one more thing to fail two seasons down the road. This keeps it to two.

The connectors are marine-grade and waterproof, which matters more than people think until they've chased down a foggy camera picture. A loose or wet coax connection shows up as snow, dropout, or a picture that comes and goes with the sea state. Garmin's install spec calls for tightening both ends to about 8 pound-inches of torque with an 8mm wrench, so they seat firmly and stay sealed. Snug them properly and forget about them.

One thing to be clear about. This is a video signal cable only. It carries the camera's picture back to your chartplotter or monitor. It does not carry power. The GC 245 and GC 255 get their power from a separate hardwired connection at the camera end, so plan your run with both the coax and the power lead in mind. Most folks pull them together through the same conduit or gunnel channel, which keeps the job clean.

Who needs the 25 meter over the 15? Bigger boats, mostly. Center consoles in the 30-plus range, express cruisers, sportfish, anything where the camera location and the helm are separated by a lot of deck and a couple of bulkheads. If you're rigging an engine room camera on a boat with the helm up top, the run adds up fast once you account for going down, across, and back up through the cable chase. Measure your actual path, not the straight-line distance, and add some slack for service loops. It's a lot easier to coil a little extra behind the dash than to come up short at the camera.

A quick word on the two cameras this feeds, since it helps to know what you're wiring. The GC 245 is the surface-mount version that sits proud on a bracket, handy for a transom or a hardtop where you can't cut a hole. The GC 255 flush-mounts for a cleaner look where you can recess it. Either way the video comes back over this coax, and a longer clean run means you can put the camera exactly where it earns its keep instead of where the stock cable happens to reach.

Install is straightforward if you plan the route first. Pull the coax through your existing conduit or a clean gunnel run, keep it away from sharp edges and hot engine components, and leave a service loop at each end. Route it alongside the camera's power lead where you can. Then torque both connectors to spec and check your picture before you button everything up. If the image is clean and stable, you're set. This is the kind of part you install once and never think about again, which is exactly what you want out of a camera cable.