Humminbird  AS GRP Precision GPS Receiver, AS GRP provides fast and precise position fixes accurate within 2.5 meters, even in lower signal areas Provides more accurate position fixes than the industry standard GPS.Power draw:28 mA Series: 1100, 900, 800, 700 fast position fixes accurate within 2.5 meters more accurate position fixes than the industry standard GPS 3.25 inch diameter, 1.5 inch high and comes with 20' cable 1 inch-14 thread count stem mountable with an optional atenna stem