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GPSMAP 176/176C Owner’s Manual 75
MAIN MENU > SETUP TAB
• RTCM In/NMEA Out—allows Differential GPS (DGPS)
input using a standard RTCM format and also provides NMEA
0183 version 2.3 output.
• RTCM In/Text Out—allows Differential GPS (DGPS) input
using a standard RTCM format and also outputs simple text
data that includes, data, time, position, and velocity.
• None—provides no interfacing capabilities.
To select a transfer mode:
1. Using the ROCKER, highlight the Transfer Mode field and
press ENTER.
2. Select the desired setting and press ENTER.
3. To revert to Garmin Data Transfer, 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 176/176C. You may have the
unit automatically scan for the DGPS beacon signal or you can enter
the beacon frequency and bit rate on the unit. 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.
3. To restart the scan, press MENU, highlight Restart Scan, and
press ENTER.