Garmin GPSMAP 496 - Aviation GPS Receiver Owner's Manual page 125

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.
Highlight Scan
and press
ENTER
Interface tab of the Setup tab with Garmin DGPS selected
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.
GPSMAP 496 Owner's Manual
• Check Wiring—the unit is not making connection with
DGPS receiver.
To restart the scan:
1. Press MENU.
2. Highlight Restart Scan, and press ENTER.
To manually enter a frequency and bit rate:
1. With the unit set to GARMIN DGPS or RTCM In/NMEA Out,
Shows the
use the ROCKER to highlight the Beacon field, and press
status of the
ENTER.
scan
2. Highlight User, and press ENTER.
3. Highlight the Frequency or Bit Rate field, press ENTER, and
enter a frequency or bit rate. Press ENTER when done.
When the unit is receiving a DGPS signal, the SNR (Signal to Noise
Ratio) and Distance fields show data. The SNR range is 0 dB to 30
dB, with 30 being the best. The Distance may or may not show data,
based on the signal being broadcast from the DGPS site.
The DGPS beacon transmitters are operated by the United States
Coast Guard (or similar government agency in other countries),
which is responsible for their accuracy and maintenance. For DGPS
transmitter problems or to find the most updated list of frequencies
and coverage areas, contact your local USCG or see their Web site at
www.navcen.uscg.gov.
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