Garmin GPSMAP 188C Sounder - Manual (Page 81)

GPSMAP 188/188C Sounder Owner’s Manual 75
M
AIN
M
ENU
> C
OMM
T
AB
Status Field
SNR and
Distance shows
data when signal
NOTE: The DGPS beacon transmitters are operated by
the U.S. Coast Guard (or similar government agency in
other countries), and are 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
http://www.uscg.mil/.
To restart the scan:
Press MENU, 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,
use the ROCKER to highlight the Beacon field, and press
ENTER.
2. Highlight User, and press ENTER.
3. Highlight the Frequency or Bit Rate field, press ENTER,
enter a frequency or bit rate, and press ENTER when
finished.
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.
When the unit is receiving a DGPS signal, the SNR (Signal to
Noise Ratio) and distance fields show data. The SNR range is
0dB to 30dB, with 30 being the best. The Distance can or can not
show data, depending on the signal being broadcast from the
DGPS site.