Garmin 128 Owner's Manual

Also see for GPS 126: Specifications

To enter a DGPS beacon frequency:1. Highlight the ‘freq’ field, and press F.2. Enter the desired frequency, and press F.3. Highlight the ‘rate’ field, and press F.4. Select the desired transmission rate, and press F.Note: The ‘freq’ and ‘rate’ fields are active onlywhen the interface is set to RTCM/NMEA.When the GPS 126/128 is receiving DGPS correc-tions from the GBR 21, the ‘beacon receiver’ section ofthe I/O setup page will display the beacon frequencyand signal strength, as well as the distance from thetransmitter to the beacon receiver. At the bottom of thebeacon receiver field, a status message will keep youinformed of DGPS activity:• A ‘Tuning’ message will be displayed while a bea-con signal is being tuned.• Once the beacon signal has been tuned, a‘Receiving’ message will be displayed.• If a beacon signal is tuned and no corrections arebeing received, a ‘No Data’ message will be dis-played.• If a beacon signal cannot be tuned, a ‘No Status’message will be displayed.The message page will alert you to any problemsrelating to DGPS operation. You may also monitor theDGPS status from the status field on the interface page.The GPS 126/128 will display one of three alert mes-sages concerning DGPS operation:No DGPS Position— there is not enough dataavailable to compute a DGPS position.No RTCM Input— the beacon receiver is notproperly connected or the baud rates do notmatch.RTCM Input Failed— DGPS data was beingreceived but has been lost.45REFERENCEDGPS InterfaceChoose an interfaceoption based upon whatequipment you are usingto transfer information.Once the RTCM/NMEAoption is selected, you canmanually tune the beaconreceiver from the frequen-cy field.