Simrad HS50 Heading Sensor
Gps hdt
Deviation
Accuracy
Last heading
Common sat.
In this display, a number of additional information on the heading solution is presented. This information is mainly used for troubleshooting the system.
An explanation of the information shown is as follows:
The heading determined from GPS alone.
The difference in heading determined from GPS and the internal gyro element.
The instantaneous heading accuracy determined from GPS alone. The instantaneous accuracy might differ from the specified accuracy which is a figure determined for the combination of GPS heading and heading from the internal data element. The specified accuracy figure for the product is also calculated as a standard deviation over a number of samples. The figure shown as Accuracy might occasionally be higher than the specified heading accuracy. If the Accuracy figure shown is much higher (3 times or more) than the specified accuracy, then the performance of the system is poor. Check Reduced heading indication, page 48 in this manual for troubleshooting the system.
This is the time since the system calculated the GPS heading. If GPS signals drops out this figure will increase. In the first 300 seconds after loss of GPS heading, the heading output is determined from the inertial element. After 300 seconds of loss of GPS heading in the system the output of heading data will terminate. If so, see Invalid Heading, page 47 for trouble shooting the system.
Shows the number of common satellites seen by the two GPS antennas. The number of common satellites have to be two or higher to determine heading. If the number is less than two, see Invalid Heading, page 47 for trouble shooting the system.
The other information in this display is only of interest to service personnel.
Number of satellites used in the GPS position fix with indication of increasing or decreasing azimuth (Az) and elevation (El).
This display is mainly used by service personnel.
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