Gps4 - Gps Position Uncertainty; Gps5 - Gps Debug Screen - Leica apMK12 Operation & Installation Manual

Operation & Installation Manual

GPS4 - GPS Position Uncertainty

GPS5 - GPS Debug Screen

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This screen presents a bar graph representing the HDOP for the past
23 hours. If you are trying to do precision work or navigation in the
same general area (within 100 miles) as the day before, you can look
at this screen to see when the best HDOP periods are. The GPS con-
stellation shifts back 4 minutes per day. That means you can expect
the GPS coverage to be virtually the same today as it was yesterday.
The small 1 hour gap in the bar graph represents the 24th hour. The
gap is provided to ease the readability of the bar graph for the present
time. The dashed line extending horizontally from the 4 represents the
current HDOP Limit Alarm, which is set in CFG Position. The current
HDOP and VDOP values are given in the upper window.
This screen is useful during satellite acquisition. It can present some
important clues as to why the MX421 GPS smart antenna is not work-
ing properly.
The first 6 rows of data represent GPS channel status. There are 4
columns of data for each channel:
Appendix C - Engineering Mode
Version 1.5
8/13/01, 11:07 AM