The H2183 has the ability to maintain 2°accuracy under dynamic motion conditions with its three-axis rate gyro and three-axis accelerometer. It is designed to be used with NMEA 0183 and NMEA 2000 devices, includes 6m NMEA2000 cable. Hosts 10 Hz update rate. The compass feature can be easily calibrated with or without PC.This heading sensor is constructed out of gray marine grade plastic. Measures approximately 4 3/8" W x 4 1/2" H x 1 7/8" D overall. Mounts with (2) 1/4" Dia. mounting holes set apart 2 3/4" center to center. Hosts (6) wire lead connections.Instructions and software included.