Garmin 010-10551-00 Marine Network Cable, 20' (RJ45)

Garmin 010-10551-00 Marine Network Cable — 20 ft (RJ45)

The Garmin 010-10551-00 is a 20-foot Garmin Marine Network extension cable with RJ45 connectors, designed to add cable run length between compatible Garmin marine electronics. It is used wherever the standard cable supplied with a chartplotter, sonar module, or radar unit is too short to reach between mounted components, or when building a multi-device helm installation that requires longer network runs.

Part Information

• Part Number: 010-10551-00
• SKU: 322-0101055100
• Brand: Garmin
• Official Product Type: Marine Network Extension Cable
• Cable Length: 20 ft (approx. 6.1 m)
• Connector Type: RJ45 (both ends)
• Network Type: Garmin Marine Network (Ethernet-based)

Compatible Applications

• Garmin chartplotters and MFDs with a Garmin Marine Network (RJ45) port, including GPSMAP 8400 series, GPSMAP 8600 series, and other Marine Network-capable models
• Garmin sonar modules requiring Marine Network connection
• Garmin radar units connected via Marine Network
• Garmin Marine Network switches such as the GMS 10 Port Expander
• Any installation where the existing cable run is too short to reach between mounted devices
• Multi-display installations requiring extended cable routing between helms or stations

System & Compatibility Notes

• This cable is for the Garmin Marine Network only — it uses RJ45 connectors and is not compatible with Garmin's Blue connector (proprietary) network cables used on some older models
• Verify your chartplotter or device uses RJ45 Marine Network ports before ordering — some Garmin devices use the proprietary Blue connector format instead
• Not compatible with NMEA 2000, NMEA 0183, or general-purpose Ethernet networks
• Marine-rated construction suitable for helm and below-deck installations
• For Fusion audio system integration, see the Garmin Marine Network to Fusion® Cable

Parts Desk Insights

Best Use Case: This cable is the go-to solution when you need to route a Marine Network connection further than the supplied cable allows — most commonly when a black-box sonar module or radar unit is mounted away from the helm, or when running a secondary display to a lower station or flybridge. The 20 ft length covers most single-run installations without needing to splice cables. For installations requiring a network switch as well as extended cable runs, pair this with the GMS 10 Port Expander.

Common Issues: The most frequent compatibility mistake is ordering this RJ45 cable for a device that uses Garmin's proprietary Blue connector network ports instead — these look similar but are not interchangeable. Always confirm your device's network port type before ordering. In marine environments, RJ45 connector contacts are vulnerable to corrosion if not properly protected — use connector covers on any unused ports and inspect connection points seasonally. A cable that works intermittently almost always has a partially unseated or corroded connector rather than a failed cable.

Related Products & Accessories

• Garmin GMS 10 Marine Network Port Expander — adds network ports for multi-device installations; pair with this cable for extended runs
• Garmin Marine Network to Fusion® Cable, 6' — connects Fusion audio equipment to the Marine Network
• Garmin J1939 Cable for GPSMAP 8400/8600 — engine data integration cable for compatible helm setups
• Raymarine A80513 RayNet (M) to RJ45 (M) Adaptor Cable — cross-brand RJ45 adapter for mixed-brand network installations

Service Interval

No scheduled service interval. Inspect RJ45 connectors and seating at both ends annually or any time network connectivity becomes intermittent. Check for corrosion on connector contacts, particularly in saltwater or high-humidity environments. Keep dust caps or protective covers on unused network ports. Replace the cable if the jacket is cracked, connectors are corroded, or signal continuity fails.

Technical FAQ

• Will this cable work with any RJ45 device on my boat? No — this cable is designed for Garmin Marine Network use. While the RJ45 connector is physically the same as standard Ethernet, the Garmin Marine Network protocol is proprietary. Do not use this cable to connect non-Garmin devices or to extend a general Ethernet network.
• How do I know if my Garmin device uses RJ45 or Blue connector network ports? Check your device's documentation or the back panel of the unit. RJ45 ports are square with a plastic tab latch, identical in appearance to a home router port. Garmin Blue connector ports use a round, locking connector. If unsure, Garmin's compatibility checker or your device's owner's manual will confirm the port type.
• Can I connect two of these cables end-to-end for a longer run? Garmin does not recommend chaining network cables with standard couplers in a marine environment due to the risk of connector corrosion and signal degradation at each join. For longer runs, source the appropriate single-length cable from Garmin's accessory range.
• Does this cable work with the GMS 10? Yes — the GMS 10 uses standard Marine Network RJ45 ports, and this cable is fully compatible for connecting devices to or from the GMS 10.
• Is this cable waterproof? The cable jacket is marine-rated for moisture and UV resistance. The RJ45 connectors themselves benefit from protective covers when not in use to prevent water ingress and corrosion, particularly in exposed cockpit or flybridge installations.