| | In a fixed installation your LD-250 antenna 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 boat or other specialized application where the direction of motion is not always forward a compass is required. Boltek's LDCMP-1 Fluxgate Compass comes prewired and ready to plug into your LD-250. | | 
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