GP1670F_1870F Operator's Manual - Furuno USA

12. MAINTENANCE, TROUBLESHOOTING12.4 GPS Status DisplayThe GPS status display shows the RX signal strength and the location of each GPSsatellite received. By default, the GPS status display is provided on a home screen.GPS 3DDescription of GPS status display• The graphic at the right side of the display shows the position of each GPS satellitein the sky. The circles are colored according to a satellite’s SNR. Green if the SNRof the satellite is high enough to be used to fix position, or red if the SNR is too lowto be used to fix position• The bars in the graph at the left show the strength of the RX signal from each satellite.Satellites that have a signal level of 40 or higher are used to fix position. Thebars are colored in the same manner as the circles.• HDOP (Horizontal Dilution of Precision) is an indication of the precision of the positionfix from the GPS based on the satellites. The lower the number the more accuratethe position fix. An HDOP of 2.0 or less is considered good, and 20.0 or abovewill result in a loss of fix.• PDOP (Position Dilution of Precision) is the accuracy of a 3D GPS position basedon the number of satellites and the geometry of satellite positions. PDOP rangesfrom 0-99. The lower the number, the more accurate the data.12-4