Simrad SIMRAD HS50 Manuel D’Utilisation

Simrad HS50 Heading Sensor 

10 

20221081 / F 

The Sensor unit is the most important part of the HS50 system, 
and great care should be taken when deciding the mounting 
location. 

The space above the Sensor unit has to be free of obstructions of 
any kind. A GPS compass is more sensitive for blocking and 
reflections (multipath) of GPS signals than GPS sensors that are 
only used for calculating position. This since HS50 also utilizes 
carrier phase measurements for heading determination, and both 
GPS antennas need to see at least two common satellites at the 
same time. 

The unit should be protected from direct illumination of radar 
beams and other transmitting antennas such as Inmarsat 
antennas.  

The Sensor unit has to be mounted horizontally in the mast or 
directly on deck, with 5° maximum allowed deviation angle 
from the horizontal plane. If mounted in the mast, the distance 
from the unit to the nearest deck should be as large as possible 
to reduce problem due to the multipath effect. 

 

The unit should also be mounted parallel to the vessel’s 
centerline with the bow arrow pointing forward. The heading 
offset feature will however compensate for a heading offset 
caused by the orientation of the Sensor unit. An eventual offset 
correction is performed after the calibration as described in 
Software setup procedure, Heading offset, page 31.