| | In a fixed installation your LD-250 antenna always points North. In a mobile installation (car, truck, boat, etc) you need a compass or GPS to tell the LD-250 which direction your antenna is pointed. In a car or truck a GPS is usually recommended for the lower cost and ease of installation. The optional LDGPS comes with 20ft of cable to plug directly into the LD-250. There are no other cables to run since the GPS is powered directly from the LD-250. | | 
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