5 Close the card reader door. Acquiring GPS Satellite Signals The device may need a clear view of the sky to acquire satellite signals. The time and date are set automatically based on the GPS position. 1 Turn on the device. 2 Wait while the device locates satellites. It may take 30 to 60 seconds to acquire satellite signals. To view the GPS satellite signal strength, select > System > Satellite Positioning . If the device loses satellite signals, a flashing question mark appears over the boat position indicator ( ) on the chart. For more information about GPS, go to garmin.com/aboutGPS . For help acquiring satellite signals, see My device will not acquire GPS signals , page 221 .
Selecting the GPS Source You can select your preferred source for GPS data, if you have more than one GPS source. 1 Select > System > Satellite Positioning > Source . 2 Select the source for GPS data. 20 GPSMAP® 8400/8600/8700 Series Owner's Manual Introduction