Simrad SIMRAD HS50 Manuel D’Utilisation

Simrad HS50 Heading Sensor 

38 

20221081 / F 

 

 

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.