Survival Gear and emergency ready Precision GPS/WAAS receiver with Heading Sensor provides fast position fixes accurate within 2.5 meters. Provides more accurate position fixes than the industry standard GPS. The receiver's dimensions are; 3.25" diameter, 1.5" high and comes with a 20' cable and has a 1"-14 thread count stem mountable with an optional antenna stem (antenna stem not included). This receiver requires software 6.570 or higher in the compatible Humminbird product. This GPS receiver will not work with Interlink.