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ProMARK X
Do this:
FIXES VARY A LOT
Troubleshooting & Operating Tips
Remove the batteries and wait for the
unit to turn off.
OR
With the batteries in place and the unit
on, create a short by using a coin to
complete the circuit between the two
center connectors in the battery com-
partment.
NOTE: This will also clear the unit's
memory.
The position accuracy of the ProMARK X is
affected by several variables, the most
important of which is the geometric quality
of the fix. Therefore, the specified accuracy
of 12 meters RMS in 2D is statistical, not
absolute and assumes the absence of SA. A
good rule of thumb is that approximately
two-thirds of the fixes will be within 12
meters of the true position and about 95%
of the fixes will be within 20 meters under
good conditions and without SA.
Since 20 meters is approximately 0.01
minute of latitude (and 0.01 minute of
longitude at the equator), it is possible to
see variations as large as ±0.03 minutes of
latitude/longitude from fix to fix when
conditions are good. Under less favorable
conditions, larger variations are normal.
You can increase position fix accuracy by
using position fix averaging, differential, or
carrier phase differential (with the Submeter
Kit).
If the unit is being operated near the poles,
small changes in position may cause great
variations in position and velocity-related
data. Refer to Using the Unit Near the Poles
later in this chapter.
8-7
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