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Reference
Status Page
Receiver Status, Accuracy and DOP
Receiver status is indicated at the top fi eld of the page, with the current Accuracy and Dilution Of
Precision (DOP) to the right of the sky view. DOP is an indication of satellite geometry quality measured
on a scale of one to ten (lowest numbers the best, highest numbers the poorest). Accuracy uses DOP
and other factors to calculate horizontal position accuracy in feet or meters. The status fi eld will show
one of the following conditions:
• Looking For Satellites— the receiver is looking for any satellites.
• AutoLocate— the receiver is looking for any satellite whose almanac has been collected. This
process can take up to fi ve minutes.
• Acquiring Satellites— the receiver is looking for and collecting data from satellites visible at its last
known or initialized position, but has not collected enough data to calculate a fi x.
• 2D Navigation— at least three satellites with good geometry have been acquired and a 2 dimensional
position fi x (latitude and longitude) is being calculated. ‘2D Differential Navigation’ will appear
when you are receiving DGPS corrections in 2D mode and a ‘D’ will show on the strength bar of
satellites being corrected.
• 3D Navigation— at least four satellites with good geometry have been acquired and your position
is now being calculated in latitude, longitude and altitude. ‘3D Differential Navigation’ will appear
when you are receiving DGPS corrections in 3D mode and a ‘D’ will show on the strength bar of
satellites being corrected.
• Poor GPS Coverage— the receiver is no longer tracking enough satellites for a 2D or 3D fi x.
• Receiver Not Usable— the receiver is unusable, possibly due to interference or abnormal satellite
conditions. Turn the unit off and back on to reset.
• Simulating Navigation— the receiver is in simulator mode.
168 Manual Part 1.indd 21 11/18/2002, 3:36:29 PM