Garmin GPSMAP 230 User Manual download pdf (Page 76)

Using NMEA & DGPS Interface Settings

If you are using an NMEA interface format, the NMEA format must be specified

in the NMEA format field that will automatically appear when an NMEA option is

selected. The appropriate baud rate will be set automatically.

To select an NMEA format:

1. Select a NMEA IN/OUT format from the options page.

2. Highlight the NMEA Format field and press

3. Select a NMEA sentence format and press

4. The baud rate will automatically be set to the appropriate speed. If you have selected an

NMEA IN/OUT setting, you must use the same NMEA format for both the input and out-

put device.

Tuning DGPS Stations

If the I/O Format is set to accept RTCM input/NMEA Output for connecting a

differential-ready GPS beacon receiver, you will need to tune a frequency in the

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

3. Enter the desired frequency and press

. If you are using an automatically-tuned

DGPS receiver, you may enter 000.0 for the frequency.

4. Press

to select a bit rate. Five bit rates are available: 0 (used for automatically-

tuned DGPS receivers), 25, 50, 100 and 200 bps. Press

to confirm. The DGPS status,

along with the signal-to-noise ratio of the tuned station, will be displayed at the bottom

of the page.

A. Select the desired format from the NMEA field.

The baud rate will automatically be set to the

appropriate speed.

B. After entering a DGPS frequency, set the bit rate

to the speed indicated on the USCG station chart.

DGPS coverage, frequencies, and bit rates are

available from the Coast Guard’s automated

FAX service (703-313-5920).

SECTION

SETUP MENUS

NMEA & DGPS Setup

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Garmin GPSMAP 230 User Manual Page 76