NMEA network connection box for boats
Suitable for stand alone (independent system) use, the NT923HDI (Heading Data Interface) provides two channels of 10Hz NMEA 0183 heading output data and one Navitron serial output derived from a Navitron Heading Sensor Coil (HSC1 or HSC2) mounted above or below a good quality externally gymballed ships magnetic compass.
The magnetic information received from the compass via the Heading Sensor Coil can be electronically corrected for deviation during installation and the resultant heading permanently displayed and transmitted at a fixed 10Hz update rate in the following NMEA sentence types (from software version 2.0 onwards) : -
Both sentences include checksum and are continuously transmitted at 10Hz on both NMEA output channels. The output channels are electrically isolated from the Ships supply and opto isolated to eliminate receiving equipment common mode connection problems.