SCX21 Satellite CompassUtilizing four separate GNSS Antennas for the ultimate in responsiveness, the SCX21 sets a new standard for reliable and accurate heading for all of your marine electronics. The four antennas ensure reliable heading performance, even under the most challenging of conditions. The unprecedented quad antenna design of the SCX21 makes it capable of calculating extremely accurate heading, pitch, roll, and heave information, even when line of sight is limited to only a single satellite. They greatly enhance the performance of onboard equipment such as Radar, Fish Finders, Sonar, and Autopilots. Features: Outputs accurate Time, Position, Heading, COG/SOG, ROT (10 degrees/second), Roll/Pitch/Heave 3-Axis Speed, Air Temperature and Air Pressure dataUnprecedented heading accuracy for Radars, Sonars, and Navigation1.0 degree heading accuracy, 0.02 knot speed accuracyExtremely compact with easy & flexible installation for reduced susceptibility to multi-path interference