Garmin GMS 10 Network Port ExpanderUpgrade your Garmin marine network with the GMS 10 Network Port Expander. This robust 100 MB switch connects multiple chartplotters and sensors over the Garmin Marine Network, delivering Ethernet like data transfer speeds that can be up to 10x faster than some competitive systems. Just plug it in and go. The GMS 10 and the Garmin Marine Network are completely plug and play, so peripherals are automatically detected and readily accessible once