GSSI SIR 20, User Manual

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Geophysical Survey Systems, Inc. SIR® 20
Manual
MN92-078 Rev F 36
Figure 35: Project Information dialog box.
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This window provides you with a choice of the three ways you can collect 3D radar data.
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Note the button for Enable GPS. You can collect GPS data along with your grid. See the section
on using a GPS for details on setup.
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You should also see a button for Calibrate SW. Be sure to calibrate your survey wheel before
you begin collection . Select Survey Belt.
Figure 36: Data Collection Mode.
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After about one second, you will see the GPS information at the right side of the window become
active. A GPS is required for Survey Belt data collection.
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Pay special attention to the data validity information. Your SIR 20 will analyze the signal from
the GPS and determine if the data is valid. It makes this determination based on the number of
satellites that the GPS can see. The more satellites, the better the signal the higher the spatial
precision of the GPS readings.
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You cannot collect GPS data with an invalid signal. Once you have assessed the data validity,
click Next > to define grid geometry.