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74 GPSMAP 188/188C Sounder Owner’s Manual
MAIN MENU > COMM TAB
To adjust the NMEA output:
1. From the Comm tab, press MENU, highlight NMEA Setup,
and press ENTER.
2. Highlight an option, and press ENTER.
3. Use the ROCKER to select a setting, and press ENTER.
Press QUIT to return to the Comm tab.
Advanced NMEA Output
Setup Page
To restore the Serial Data Format settings back to the
default Garmin Data Transfer:
From the Comm tab, press MENU, highlight Defaults, and
press ENTER.
If Garmin DGPS or RTCM In/NMEA Out format is selected,
additional fields are provided to control a Garmin differential
beacon receiver directly from your GPSMAP 188/188C Sounder.
The unit can automatically scan for the DGPS beacon signal, or
you can enter the beacon frequency and bit rate on the unit and the
information is used to tune the beacon receiver.
To have the unit automatically scan for a frequency:
1. With the unit set to Garmin DGPS or RTCM In/NMEA Out,
use the ROCKER to highlight the Beacon field, and press
ENTER.
2. Highlight Scan, and press ENTER. The numbers in the
Frequency field change as the unit scans from 284 kHz to
325 kHz, 200 bit rate, then 100 at 6-second intervals.