The GX1800GW is an ultra compact (3. 5" depth) 25 Watt Fixed Mount VHF with integrated 66 channel WAAS GPS receiver. Out of the box and ready to go, saving the extra step of having to add additional wiring to a separate GPS output. This radio is capable of being connected to a remotely mounted full functioning second station (RAM mic). The GX1800G is a full functioning Class D DSC radio, including DSC Distress Calling, Individual Calling, Group Calling, All ships Calling and Position Sharing. The extra large, extra bright high resolution Dot Matrix display makes operating this radio easy and efficient. All Standard Horizon radios are backed by an industry leading 3 year waterproof . Features: Integrated 66 Channel WAAS GPS receiver Second Station RAM mic compatible Ultra compact 3. 5" depth for ease of mounting Large, bright high resolution Dot Matrix DisplayIPX8 Waterproof design