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GPS
number and the columns represent the 1's digit of the ID number. The
satellite system consists of up to 32 ID numbers. The ID numbers are
called PseudoRandom Numbers.
To find a particular satellite ID, for example PRN 24, go down the left
hand column and locate the 10's digit (2- in this case). Then go across
the row until you intersect with the appropriate 1's digit (in this case 4).
The bottom window provides some basic satellite tracking performance
information. The HDOP and VDOP values indicate the current Hori-
zontal or Vertical Dilution Of Precision.
The Used Sats value indicates the number of satellites used in the
navigation filter to calculate your position
The Elevation Mask sets the lowest elevation at which a satellite will
be tracked. Satellites with an elevation below this number will not be
tracked, even if they are otherwise available to track.
Unhealthy Satellites
Satellites are expected to fail at some point in time and they may cause
the position calculation to become erroneous. With RAIM enabled
units, you will be able to determine which satellite PRN number is
causing the position error. The operator can then decide to manually
force the offending satellite to "unhealthy". A satellite that is marked
as unhealthy will not be used for position calculation.
To mark a satellite as unhealthy, do the following;
1. Press the E key.
2. Move the cursor to the PRN number using the cursor keys.
3. Press the "Force Unhealthy" softkey. The "H" mark for healthy will
become "-" for unhealty.
4. Press the E key to exit.
Version 2.0
Operator's Manual
95
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