Gps Status Display - Furuno GP-25 Operator's Manual

11.4

GPS Status Display

The GPS status display shows the RX signal strength and location of each GPS sat-
ellite being received. To show the GPS status display, open [Home] then tap the [Plot-
ter] menu icon followed by [GPS Status]. Tap [Exit] to close the status display and
return to the Plotter display.
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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 27 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 it is currently using and their geometry.
The lower the number the more accurate the position fix. An HDOP of 4.0 or less is
considered good, and 20.0 and 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.
11. MAINTENANCE, TROUBLESHOOTING
11-3