Simrad SIMRAD HS50 Manuel D’Utilisation

OPERATING INSTRUCTIONS 

20221081 / F 

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The HS50 will normally output signals on the serial lines 
without any involvement from the user. However, the following 
should be taken into consideration during operation: 

 

In periods with weak satellite geometry, the position can be 
made more accurate by using height aiding function in the 
General submenu. Refer General, page 28. 

The height aiding improves the solution by using the knowledge 
that a vessel at sea has only small short-term variations in height 
caused by heave. The long-term variations caused by tide are 
taken care of in the system. The height value used, as input to 
the GPS solution is a low-pass filtered value of the measured 
height. 

A start value for the low-pass filter should be specified for use at 
system start-up. The value to use is the height of the Sensor unit 
above the WGS-84 ellipsoid when the sea level is at its mean 
value. This height can be found in the primary Navigation/POS 
display, where the HGT value is the GPS height. Refer 
Navigation/POS display, page 36. The value should be 
monitored for some minutes, and the average value should be 
used. 

Note! 

For normal operation, height aiding should be set to FILTER or 
OFF. When FILTER or FIXED is selected, an initial height 
has to be entered. 

Height aiding is active only with input of differential GPS.