8-168.13 BEACON RECEIVER SETUP (INTERFACES)The Beacon Receiver Setup Pageallows the GPS 95 to control GARMIN'sGBR 21 differential beacon receiver.In order to use the beacon receiver,the “RTCM/NMEA” and “NMEA 0183”settings must be selected. If theseinterface settings are not selected, theGPS 95 will only display the message“No RTCM/NMEA 0183 interface selected” on the Beacon Receiver SetupPage.The “Tuned To:” field is the frequency, in kilohertz (kHz), to which the beaconreceiver is currently tuned or is attempting to tune. Below this field is a bit ratecyclic field which allows you to choose between bit rates of 25, 50, 100 and200 bps (bits per second) by pressing CLR while the “Bit Rate” cyclic field ishighlighted.When you first select the Beacon Receiver Setup Page, the GPS 95 andGBR 21 will automatically try to tune the last frequency and bit rate which youselected. You may enter your own frequency (between 283.5 kHz and 325.0kHz in 0.5 kHz increments) and bit rate if desired. A message of “Tuning” willthen be displayed near the bottom of the page, directly after the “SNR” field.You must provide the unit with another frequency and bit rate before it willattempt to tune again.If the beacon receiver receives the selected frequency at the chosen bit rate,the “SNR” field will display the received signal-to-noise ratio and the statusmessage will be one of the following:Receiving- The GPS 95 is receiving status and DGPS correction informationfrom the beacon receiver.No Data - The GPS 95 is receiving status information from the beaconreceiver, but not DGPS correction information.When a chosen frequency and bit rate result in a status of “Receiving”, theGPS 95 will use the DGPS corrections from the beacon receiver to calculatedifferential positions. Also, the “Distance” field will show the distance to thebeacon being received.