Garmin BlueNet 20 Switch Marine Electronic Accessory - Increase the number of available network ports in a Garmin BlueNet network. Once you've used all the ports on your compatible chartplotter just add a Garmin BlueNet 20 switch to the setup and keep constructing your expansive high-speed network. In The Box: Garmin BlueNet 20 Switch Power cable Mounting hardware Garmin BlueNet network cable (2 meters) Documentation