Model 3440 H-3
Two master stations, located on either coast, collect data from
the reference stations to create a GPS correction message. This
message is then broadcast through two geostationary satellites
that are in a fixed position over the equator. The GPS receiver
applies the correction factors contained in the correction
message to increase the accuracy of its measurements.
Note that the signals from the WAAS satellites may not be
available to gauge users in locations where trees, mountains,
and other large objects obstruct the view of the horizon. On
other occasions, the GPS receiver may not be able to access the
signals from the three satellites required to determine a
position. As noted earlier, the gauge stores location information
with the results of each measurement. The measurement
display also denotes the quality of the location fix as follows:
f If WAAS information is available during a gauge
measurement, the latitude and longitude will be displayed to
the nearest hundredth (1/100) of a second.
f If a GPS location is determined, but the WAAS information is
unavailable, the latitude and longitude will be displayed to
the nearest tenth (1/10) of a second.
f If the GPS receiver cannot determine a location, the latitude
and longitude will be denoted as 0.
NOTE
The Wide Area Augmentation System (WAAS) is
currently functional only in the United States.
NOTE
If a Model 3440 equipped with the GPS option is
moved a long distance between uses, the GPS system
must be allowed to initialize. Initialization may take as
long as 30 to 45 minutes after the gauge is powered
and GPS enabled. The gauge must be positioned such
that the GPS receiver can receive signals from the GPS
satellites. If the GPS does not initialize within 45
minutes, contact your Troxler representative.
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