SHOUT ts User Guide Version B
Document Number: 451-92854-001B
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7
U
TILITIES
M
ENU
The
Utilities
menu provides six options used mainly to check for proper hardware
operation and network setup.
Figure 22: Utilities Menu
7.1
C
HK
GPS
The Check GPS [
Chk GPS
] option forces the SHOUT ts to turn on its GPS receiver and
to continuously update and display GPS data in real-time. The GPS receiver remains
on until you leave this screen by pressing the back button. Use the
Reset Ephemeris
key to
force the SHOUT ts to erase saved ephemeris in its memory and download a new set of
ephemeris data. Be careful not to deplete the battery power by staying on this option for
too long.
Monitor the accuracy of the position by observing the Horizontal Accuracy (HACC). HACC is
measured in meters. HACC is defined as the radius of a circle centered on the true value
that contains the GPS measurement. Thus, a position fix with ten meters’ HACC accuracy
indicates that it is within ten meters of the true position—the higher the HACC value, the
less accurate the GPS measurement.
The Check GPS option is a good indicator of whether or not the GPS receiver has sufficient
signal to initiate a Way Point or a Test Report when located in a challenging environment,
e.g., in dense foliage or around urban settings with tall buildings. You can monitor HACC in
real-time to ensure it converges to a small and stable value (usually less than 25 meters).
At which point, it is certain that a 3D fix can be obtained with the most current ephemeris
data being updated and saved. You can then go back to the
Utilities
menu to send a test