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12. MAINTENANCE, TROUBLESHOOTING
12-4
12.4 GPS Status Display
The GPS status display shows the RX signal strength and the location of each GPS
satellite received. By default, the GPS status display is provided on a home screen.
Description of GPS status display
The graphic at the right side of the display shows the position of each GPS satellite
in the sky. The circles are colored according to a satellite’s SNR. Green if the SNR
of the satellite is high enough to be used to fix position, or red if the SNR is too low
to be used to fix position
The bars in the graph at the left show the strength of the RX signal from each sat-
ellite. Satellites that have a signal level of 40 or higher are used to fix position. The
bars are colored in the same manner as the circles.
HDOP (Horizontal Dilution of Precision) is an indication of the precision of the posi-
tion fix from the GPS based on the satellites. The lower the number the more accu-
rate the position fix. An HDOP of 2.0 or less is considered good, and 20.0 or above
will result in a loss of fix.
PDOP (Position Dilution of Precision) is the accuracy of a 3D GPS position based
on the number of satellites and the geometry of satellite positions. PDOP ranges
from 0-99. The lower the number, the more accurate the data.
GPS 3D
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