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Fig. 22a
Fig. 22b
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Receiver Status and EPE
Receiver status is indicated at the top left of the page, with the current horizontal
accuracy (estimated position error, in feet or meters) at the top right. The status will
be shown as one of the following conditions:
Searching— the GPS II
+
is looking for any available satellites in view (Fig. 22a).
AutoLocate— the GPS II
+
is initializing and collecting new almanac data. This
process can take 5 minutes, depending on the satellites currently in view.
Acquiring— the receiver is collecting data from available satellites, but has not
collected enough data to calculate a 2D fix.
2D Navigation— at least three satellites with good geometry have been locked
onto and a 2-dimensional position fix (latitude and longitude) is being calculat-
ed. ‘2D Diff’ will appear when you are receiving DGPS corrections in 2D mode.
3D Navigation— at least four satellites with good geometry have been locked
onto, and your position is now being calculated in latitude, longitude and alti-
tude. ‘3D Diff’ will appear when you are receiving DGPS corrections in 3D mode.
Poor GPS Coverage— the receiver i s n ’t tracking enough satellites for a 2D or
3D fix due to bad satellite geometry (Fig. 22b).
gps ii + Mon (final?) 2/9/98 4:24 PM Page 22