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Reference
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GPS Tab
best when there are no nearby obstructions such as buildings, mountains, etc. WAAS satellites will be
numbered 33 or higher when viewing the sky view on your GPSMAP 182/182C/232. Initial reception
of the WAAS signal may take up to 15-20 minutes, then 1-2 minutes afterwards. When WAAS differen-
tial correction has been received for GPS satellites (numbers 32 or below), a ‘D’ will appear in the signal
bar of the sky view and ‘2D or 3D Differential’ will appear in the receiver status. To learn more about
the WAAS system, its satellite positions and current state of development, visit the FAA web site (http:
//gps.faa.gov). Since WAAS requires CPU resources of the GPSMAP 182/182C/232 to search for and
track the satellites, you may disable the WAAS feature to improve unit performance if WAAS reception
is not available in your area.
To Disable/Enable WAAS capability:
1. From the GPS Tab, press MENU, then use the ARROW KEYPAD to highlight ‘WAAS Off’ or ‘WAAS
On’ and press ENTER/MARK.
Receiver Status, Accuracy and DOP
Receiver status is indicated at the top fi eld of the page, with the current Accuracy and Dilution Of
Precision (DOP) to the right of the sky view. DOP is an indication of satellite geometry quality measured
on a scale of one to ten (lowest numbers the best, highest numbers the poorest). Accuracy uses DOP
and other factors to calculate horizontal position accuracy in feet or meters. The status fi eld will show
one of the following conditions:
• Looking For Satellites— the receiver is looking for any satellites.
• AutoLocate— the receiver is looking for any satellite whose almanac has been collected. This
process can take up to fi ve 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 fi x.
• 2D— at least three satellites with good geometry have been acquired and a 2 dimensional position
fi x (latitude and longitude) is being calculated. ‘2D Differential’ will appear when you are receiving
DGPS corrections in 2D mode and a ‘D’ will show on the strength bar of satellites being corrected.
Highlight ‘WAAS Off’ and
press ENTER/MARK to
disable the WAAS
capabilities.
182C Manual Part 2.indd 53 6/4/2003, 2:54:11 PM