Garmin GPSMAP 278 User Manual

Page 95

• Text Out—allows the unit to output simple text data that

includes data, time, location, and velocity. The Baud can be

set to 1200, 2400, 4800, or 9600.

• None—provides no interfacing capabilities.

If you select GARMIN DGPS or RTCM In/NMEA Out format,

you can control a differential beacon receiver directly from your

GPSMAP 278 using the COM 1 or COM 2 sub tab. You can have

the unit automatically scan for the DGPS beacon signal, or you

can enter the beacon frequency and bit rate on the unit, and the

information will be used to tune the beacon receiver. If you use a

DGPS receiver, WAAS capability is automatically turned off.

To have the unit automatically scan for a frequency:

1. Set the unit to

GARMIN DGPS or RTCM In/NMEA Out.

2. Highlight the

Beacon field, and press ENTER.

3. 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.

COM 1 Sub Tab with Garmin DGPS Selected

Highlight

Scan

and press

ENTER.

Shows the

status of the

scan

The Status field shows one of the following:

•

Tuning—the unit is attempting to tune to the specified

frequency and bit rate.

• Scanning—the unit is automatically scanning through the

frequencies and bit rates.

• Receiving—the unit is receiving DGPS signal and ready for

operation.

• Check Wiring—the unit is not making connection with

DGPS receiver.

GPSMAP 278 Owner’s Manual

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