Garmin GPSMAP 188C Sounder - Manual (Page 48)

42 GPSMAP 188/188C Sounder Owner’s Manual
M
AIN
M
ENU
> GPS T
AB
• AutoLocate—the receiver is looking for any satellite whose
almanac has been collected. This process can take up to five
minutes.
• Acquiring Satellites—the receiver is looking for and
collecting data from satellites visible at its last known or
initialized position, but has not collected enough data to
calculate a fix.
• 2D—at least three satellites with good geometry have been
acquired and a 2 dimensional position fix (latitude and
longitude) is being calculated. “2D Differential” appears
when you are receiving DGPS corrections in 2D mode and a
D shows on the strength bar of satellites being corrected.
• 3D—at least four satellites with good geometry have been
acquired and your location is now being calculated in
latitude, longitude and elevation. “3D Differential” appears
when you are receiving DGPS corrections in 3D mode and a
D shows on the strength bar of satellites being corrected.
• Poor GPS Coverage—the receiver is no longer tracking
enough satellites for a 2D or 3D fix.
• Receiver Not Usable—the receiver is unusable, possibly
due to interference or abnormal satellite conditions. Turn the
unit off and back on to reset.
• Simulating—the receiver is in Simulator Mode.
The Differential Receiver status shows one of the following:
• Off—No optional beacon receiver attached or enabled in the
Comm menu or WAAS Off.
• Searching For WAAS—WAAS is enabled and receiver is
searching for WAAS signal.
• Using WAAS—WAAS capability enabled and unit receiving
WAAS corrections.
• No Beacon Signal—DGPS receiver attached, but not
transmitting RTCM data to GPS.
• Tuning Beacon—receiver is tuning manual DGPS
frequency.
• Receiving Beacon—unit is receiving DGPS corrections.
• Scanning Beacon—DGPS receiver is scanning for available
frequency.
The Differential SNR (Signal to Noise Ratio) indicates, on a range
to 0-30db with 30db being the best, the strength of the DGPS signal
being received. The SNR depends on the mounting of your DGPS
receiver and the distance from the DGPS transmitting station. If
no optional DGPS receiver is used with the GPSMAP 188/188C
Sounder, the DGPS Rcvr field displays Off.