Reduced Position; No Differential Corrections - Simrad HS52 Instruction Manual

Simrad HS52 GPS compass and DGPS navigator
60
If invalid position, then proceed as follows:
• The Sensor unit is unable to see enough GPS satellites. Press
the NAV2/POS button until the Skyplot appears, and check
that at least three satellites are listed in the Satellite Skyplot -
see "Navigation/POS Display" on page 46. If the criterion
above is not fulfilled, the mounting location of the Sensor
unit may not be suitable or there may be an obstruction
between the Sensor unit and the GPS satellites. Check the
mounting location and consider moving the vessel to another
location or a relocation of the Sensor unit according to the
guidance described in "Location of the Unit" on page 12.
If there are still no valid position data, consult your nearest
Simrad dealer for assistance.

Reduced Position

The reason for reduced position can be:
•
The position status reduced will only occur if the horizontal
position accuracy exceeds the selected accuracy level. See
chapter General for selection of the accuracy level.

No Differential Corrections

The possible reason for a white box for differential correction
indication (DIF) could be one of the following:
• No differential corrections are input through terminal port
P205 or P206 on the Processing unit. If differential
corrections are input through one of these terminal ports,
check that the parameters are properly set up in the Display
unit setup menu Diff. input - see page 28.
• You can be out of range to a radio reference station and the
differential corrections are therefore missing. If the reference
station is too far away or it is in the shadow of geographical
obstructions or other equipment on board, reception may be
unreliable or missing. Pressing the
display GPS Information shows the identification number of
the reference stations connected to the HS52.
• The reference station can be out of function. Check the status
of the reference station with the authorities responsible for it,
or consult your nearest Simrad dealer for assistance.
button and the
INFO
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