Garmin BlueNet™ 30 Gateway. Required for Garmin BlueNet™ network compatible devices to network with legacy Garmin marine devices. Through this gateway you can connect a Garmin BlueNet network to a legacy Garmin Marine Network for a premium control experience. Only one Garmin BlueNet 30 gateway can be installed in a mixed network. Attempting to install more than one gateway in a network will result in poor performance or no communication between devices.