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GPS quality indicators
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- GPS quality indicators
On each logging screen as well as on the Satellite Status
screen, you can see at the bottom two numbers that give
you a good indication of how accurate your positions
should be.
The first is the number of satellites that the receiver is
tracking. Tracking three satellites will allow you to calcu-
late a 2D position (lat/lon) using the last altitude recorded
by the receiver. This is fine on flat land or on the water,
but if you are in hilly terrain, your accuracy may suffer.
You need to track at least 4 satellites to get a 3D position
(lat/lon/altitude).
The second number is the Positional Dilution of Precision,
which is an estimate of accuracy that the receiver con-
stantly calculates using the geometry of satellites in the
sky. The more satellites that are being tracked and the
more evenly they are distributed around the sky, the better
the accuracy. PDOP values less than 4 or 5 are good. If
the PDOP value is over 10, you should consider moving to
an area with a clearer view of the sky and recording fea-
tures with offsets.
- Closing a job
To close a job, press MENU, highlight the Close Job option
(first option in the list) and press ENTER. You cannot
accidentally lose data with a MobileMapper Pro receiver
unless you open the receiver and lose the internal memory
card, or somehow if you corrupt the data on the card,
which is extremely rare.
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