Utilities Menu - Iridium SHOUT nano User Manual

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Utilities Menu

U
TILITIES The Utilities menu provides six options used mainly to check for proper hardware
and network setup. These include Check GPS, Check Iridium, send Test Report,
Check Mailbox, Check-In and Way Points.
Check GPS
Check GPS option forces the SHOUT nano to turn on its GPS receiver and to
continuously update and display GPS data in real-time whether there is a valid fix
or not. The GPS receiver remains on until user leaves this screen by pressing the
BACK button. The Reset Ephemeris soft key is used to force the nano to erase
saved ephemeris in its memory and download a new set of ephemeris data. User
must be careful not to deplete the battery power by staying on this option for too
long.
The accuracy of the position can be monitored by observing the HACC. HACC
stands for horizontal accuracy 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
measurement.
Check GPS option is a good indicator of letting user know whether or not 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. HACC can be
monitored in real-time to make sure it converges to a small and stable value
(usually less than 30 meters). At which point, it is certain that a 3-D fix can be
obtained with the most current ephemeris data being updated and saved. User
SHOUT nano User's Manual Version 1.0
position—the higher
Iridium
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GPS
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Utilities
Check GPS
the HACC value, the less accurate the GPS
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