Table of Contents
1 Introduction and description of fluxgate compass.
1.1 Description of compass
1.2 Connections
1.2.1 Normal
1.2.2 Variants -CP
1.3 Switches
1.4 Indicator light
1.5 Power supply.
1.6 Mounting
2 Connecting the compass to your application.
2.1 To a NMEA-0183 instrument.
2.2 To a PC serial port.
3 Output formats available from compass.
3.1 NMEA-0183
3.2 Furuno AD-10
4 Calibrating the compass.
4.1 Why the compass needs calibrating.
4.2 Starting calibration.
4.3 Aborting a bad calibration.
4.4 Setting reference NORTH heading
4.5 Set-up suggestions
5 Configuration
6 References
1. Introduction and description of fluxgate compass.
1.1 Description of compass.
The Astra Yacht NMEA compass unit is a complete component for a compass system indicating,
RADAR ‘North-up’ input or autopilot. It is housed in a water-resistant enclosure so it can be
mounted outside a steel hull. It delivers heading data in two industry-standard forms.
The A5022 contains a fluxgate with floating core surrounded by high-precision interface circuits, which,
together with the special clockwise/anticlockwise and offset nulling sequence allow a
microprocessor to acquire a binary value from two orthogonal sensors of the horizontal component
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