Garmin GMS 10 Marine Network Port Expander | 010-00351-00

Garmin GMS 10 Marine Network Port Expander — 010-00351-00

The Garmin GMS 10 is a 100 Mbps marine network switch that expands the number of devices you can connect on the Garmin Marine Network. It allows multiple chartplotters, multifunction displays (MFDs), sonar modules, and compatible sensors to share data at Ethernet-like speeds — significantly faster than NMEA 2000 or older serial-based connections. All ports use standard Garmin Marine Network cables, making the GMS 10 fully plug-and-play with no configuration required.

Part Information

• Model: GMS 10
• Part Number: 010-00351-00
• SKU: 322-0100035100
• Brand: Garmin
• Official Product Type: Marine Network Port Expander / Network Switch
• Network Type: Garmin Marine Network (proprietary Ethernet-based)
• Data Rate: 100 Mbps
• Waterproof: Yes

What the GMS 10 Does

The Garmin Marine Network is a high-speed data bus connecting Garmin chartplotters, sonar modules, radar, and other compatible devices. Without the GMS 10, you are limited to the number of network ports on your MFD. The GMS 10 adds multiple additional ports so you can expand your system as needed — connecting additional displays, a sonar module like the GSD 24, radar, or sensors — all sharing the same high-speed network without any speed penalty. Standard Garmin Marine Network cables plug directly into the GMS 10 ports; no special adapters or configuration are required.

Compatible Applications

• Any Garmin chartplotter or MFD with a Garmin Marine Network port (including GPSMAP 8400/8600 series, GPSMAP 7x3 series, and other compatible models)
• Garmin sonar modules requiring Marine Network connection (e.g. GSD 24 Black-Box Sonar Module)
• Garmin radar units connected via Marine Network
• Multi-display helm installations requiring more than two network-connected devices
• Installations adding a MSC 10 Satellite Compass or other Marine Network sensors
• Fusion audio systems connected via Marine Network to Fusion® cable

System & Compatibility Notes

• Designed exclusively for the Garmin Marine Network — not compatible with NMEA 2000, NMEA 0183, or standard Ethernet (RJ-45) networks
• Uses standard Garmin Marine Network Blue connector cables throughout
• Fully plug-and-play: no software configuration or network setup required
• Waterproof construction suitable for exposed helm installations
• All connected devices share the 100 Mbps bandwidth — plan connections accordingly on high-data-rate sonar or radar installations

Parts Desk Insights

Best Use Case: The GMS 10 is the right solution any time you need to connect more Garmin Marine Network devices than your chartplotter's built-in ports allow. The most common scenario is a dual-display helm with a black-box sonar module and radar — typically requiring three or more network ports. It's also the standard solution when adding a second station display at a lower helm or flybridge to share sonar and chart data from a single source without running separate transducer cables. Garmin installations with four or more networked devices almost always require a GMS 10.

Common Issues: The GMS 10 works only on the Garmin Marine Network — it cannot be used to connect non-Garmin devices, standard Ethernet equipment, or NMEA 2000 sensors. Customers sometimes confuse it with a general marine network hub; it is proprietary to Garmin's Blue connector network. Cable quality and connector seating are the most frequent cause of intermittent data dropouts — inspect all Blue connector fittings and ensure they are fully seated and locked. If a device is not appearing on the network after connecting through the GMS 10, power-cycle the entire network (all displays and the GMS 10) before troubleshooting further.

Related Products & Accessories

• Garmin GSD 24 Black-Box Sonar Module — sonar module commonly connected via GMS 10
• Garmin MSC 10 Marine Satellite Compass — heading/compass sensor for the Marine Network
• Garmin GPSMAP 8616xsv 16" Chartplotter/Fishfinder — compatible flagship MFD
• Garmin GPSMAP 8416xsv 16" Chartplotter with CHIRP Sonar — compatible MFD
• Garmin GPSMAP 8412 12" Chartplotter — compatible MFD
• Garmin GPSMAP 723 7" Chartplotter — compatible chartplotter
• Garmin Marine Network to Fusion® Cable, 6' — connects Fusion audio systems to the Marine Network via GMS 10
• Garmin Marine Network to Fusion® Cable, 6' (alternate) — alternate Fusion connection cable
• Garmin Yamaha® Engine Bus to J1939 Adapter Cable — engine data integration for compatible helm setups

Service Interval

No scheduled service interval. Inspect all Marine Network cable connections and Blue connector fittings annually or any time intermittent network issues occur. Keep connector caps in place on any unused ports to prevent moisture ingress. Clean connector contacts with a dry cloth if corrosion or discoloration is visible. Replace the unit if internal switching performance degrades or if physical damage to the housing or ports is evident.

Technical FAQ

• How many devices can I connect to a GMS 10? The GMS 10 provides multiple additional Marine Network ports. Garmin documentation specifies the exact port count — verify the current spec sheet for your installation planning. Multiple GMS 10 units can be daisy-chained on larger systems.
• Can I connect non-Garmin devices to the GMS 10? No. The GMS 10 is designed exclusively for the Garmin Marine Network using Garmin's proprietary Blue connector cables. It cannot interface with NMEA 2000, NMEA 0183, or standard RJ-45 Ethernet networks.
• Does the GMS 10 require any configuration? No — it is fully plug-and-play. Connect your Marine Network cable from the chartplotter to any GMS 10 port, and connect additional devices to the remaining ports. Garmin devices will detect each other automatically on the network.
• Will adding the GMS 10 slow down my network? All connected devices share the 100 Mbps bandwidth. For most installations with two to four devices, there is no noticeable performance impact. Very high data-rate combinations (e.g. multiple high-frequency sonar modules simultaneously streaming) may see some sharing of available bandwidth.
• What cable do I need to connect to the GMS 10? Standard Garmin Marine Network cables with Blue connectors. The cable length you need depends on the distance between your chartplotter, GMS 10, and connected devices at your helm installation.