Overview

The Garmin 010-10918-00 is a power/data cable for Garmin Fishfinder 300C and 400C units and GPSMAP 400 and 500 series chartplotters. It’s the harness used to bring vessel power to the display while also providing the device’s data connection points for integration with other onboard electronics.

Use this cable when you’re installing one of the compatible displays at the helm, in a protected electronics box, or anywhere you need a clean run from the boat’s DC distribution to the unit. It’s also a practical spare to keep aboard, since a damaged lead can take the display offline even when the rest of the system is fine.

Key features

• Power/data cable for Garmin Fishfinder 300C and 400C, and GPSMAP 400 and 500 series devices
• Combines the unit’s power feed and data connections in one cable run to simplify rigging behind the console
• Useful for new installs, refits, or replacing a worn cable where the display is frequently unplugged for storage
• Helps keep wiring organized when routing through tight helm spaces or electronics panels

Compatibility and fit

Compatible with Garmin Fishfinder 300C, Fishfinder 400C, GPSMAP 400 series, and GPSMAP 500 series. Match the display model and the cable connection at the back of the unit before ordering, especially if your boat has a mix of Garmin generations installed.

Installation and setup

Plan the cable route from the display location to your DC distribution point with extra slack for service loops and strain relief. In a marine environment, keep connections supported so vibration does not work terminals loose, and use a drip loop where the cable enters an enclosure to reduce the chance of moisture tracking along the jacket.

When tying into the boat’s electrical system, follow standard marine wiring practices: protect the feed with the appropriate fuse or breaker near the power source, make solid crimp connections, and seal splices with adhesive-lined heat shrink to limit corrosion in humid or saltwater air.

Use cases on board

This cable is a good match for boats where a Fishfinder 300C or 400C, or a GPSMAP 400 or 500 series display is used for basic navigation and sonar while still needing access to the unit’s data connections for simple system integration. It also makes sense for owners who trailer or cover their boat often and want a spare harness on hand in case a cable gets pinched or pulled during seasonal setup.