This device is compatible with both Garmin BlueNet™ chartplotters and Garmin^® Marine Network chartplotters. You must consider the combination of your radome model and chartplotter model when planning your marine network.

A GMR™ 18 HD3 radome is equipped with a Garmin Marine Network connector. Before connecting it to your marine network, observe these considerations.

• If your boat is equipped with only Garmin Marine Network devices, you can connect the GMR 18 HD3 radome to any open port on your Garmin Marine Network chartplotter or your GMS™ 10 network port expander using the included Garmin Marine Network cable.

• If your boat is equipped with a Garmin BlueNet chartplotter, you must connect the GMR 18 HD3 radome through a Garmin BlueNet 30 gateway (not included) using the included Garmin Marine Network cable.

A GMR 18/24 xHD3 radome is equipped with a Garmin BlueNet connector. Before connecting it to your marine network, observe these considerations.

• If your boat is equipped with a Garmin BlueNet chartplotter, you should connect the GMR 18/24 xHD3 radome to an open network port on the Garmin BlueNet chartplotter or the Garmin BlueNet 20 switch, using the included Garmin BlueNet cable.

• If your boat is equipped with a Garmin BlueNet chartplotter and uses a Garmin BlueNet 30 gateway to connect Garmin Marine Network devices, you should connect the GMR 18/24 xHD3 radome to the Garmin BlueNet side of your network using the included Garmin BlueNet cable for the best performance and to best support future updates.

• If your boat is equipped with only Garmin Marine Network devices, you must use the included Garmin Marine Network adapter cable to connect the GMR 18/24 xHD3 radome to your network. This adapter cable is supplied in the box with the Garmin BlueNet cable.

For more information about Garmin BlueNet technology, including best practices for constructing a network including both Garmin BlueNet devices and Garmin Marine Network devices, go to garmin.com/manuals/bluenet.