Garmin GPSMAP 175 Owner's Manual

Garmin GPSMAP 175 Owner's Manual Manual pdf 74 page image

A. Select the desiredformat from theNMEA field. Thebaud rate willautomatically be setto the appropriatespeed.B. After entering aDGPS frequency, setthe bit rate to thespeed indicated on the USCG station chart. DGPS coverage, frequencies, and bitrates are available from the Coast Guard.SETUP MENUSNMEA & DGPS SetupIf you are using an NMEA interface format, the NMEA format must bespecified in the NMEA format field that will automatically appear when anNMEA option is selected. The appropriate baud rate will be set automatically.To select a NMEA format:1. Select a NMEA IN/OUT format from the options page.2. Highlight the NMEA Format field and press T.3. Select a NMEA sentence format and press T.4. The baud rate will automatically be set to the appropriate speed. If youhave selected an NMEA IN/OUT setting, you must use the same NMEAformat for both the input and output device.Tuning DGPS StationsIf the I/O Format is set to accept RTCM input/NMEA Output for connectinga differential-ready GPS beacon receiver, you will need to tune a frequency inthe tuning field and select a bit rate. The default frequency will be 304.0 kHz,with a bit rate of 100 bps, or the last DGPS frequency/bit rate selected.To tune a DGPS frequency:1. Select the ‘RTCM In/NMEA Out’ format from the options page.2. Highlight the beacon receiver frequency field and press T.3. Enter the desired frequency and press T. If you are using anautomatically-tuned DGPS receiver, you may enter 000.0 forthe frequency.4. Press T to select a bit rate. Five bit rates are available: 0 (used forautomatically-tuned DGPS receivers), 25, 50, 100 and 200 bps. Press T toconfirm. The DGPS status, along with the signal-to-noise ratio of the tunedstation, will be displayed at the bottom of the page.709