"The Simrad GS25 GPS Antenna brings the ideal GPS solution for any navigator who needs extremely accurate and fast positioning updates. Unlike ordinary position-only antennas, the Simrad GS25 GPS Antenna provides magnetic heading for accurate boat direction at any speed and for radar/chart overlay. Advanced 10Hz high-speed position updating ensures smooth and virtually instant position updating10 times per second. The 16-channel receiver delivers rapid signal acquisition with consistent position accuracy and eliminates ""jumping"" on the display, ideal for high-speed powerboats. This high-performance Simrad antenna easily connects to any Simrad NS Series multifunction display or any NMEA 2000 network, and provides 100% compatibility with WAAS, EGNOS, MSAS, Glonass, Galileo, and QZSS satellite systems. Waterproof construction lets you choose pole- or surface-mounting on any vessel.Manufacturer model #: 000-11043-001. High-speed position updating Rapid signal acquisition Consistent position accuracy Integrated magnetic heading NMEA2000 connectivity 100% compatible with WAAS, EGNOS, MSAS, Glonass, Galileo, and QZSS satellite systems Compact design Waterproof construction"