Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 289)

GPS Module
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Convergence Calculator
1. Go to the Survey > Projection Calculator screen.
2. Choose a point on the mapping plane for convergence
computation in the Select Point control. Tap Solve Rotation>.
3. The convergence and rotation are calculated. The convergence is
displayed in the Geodetic N to Grid N box. The rotation is
displayed in the Grid N to Geodetic N box.
4. Tap Accept when you are done. Both numbers are saved in the
Past Results
list so you can use them in other calculations.
Tutorial GPS Jobs
This section contains sample jobs to illustrate all of the main
functions of Survey Pro GPS Module. Each job illustrates different
horizontal and vertical projection methods as well as different GPS
field procedures.
Before Starting
• Make sure you have the file demofile.txt in the same directory as
the Survey Pro executable (usually in Disk\Program
Files\Survey Pro or Built In Storage\Program Files\Survey Pro).
• Make sure you have the files TDSControl_Ground.job and
TDSControl_ORNorth.job loaded on the data collector.
• Make sure you have the geoid files Oregon G99.ggf and North
America EGM96.ggf in the geodata directory (\Built in
Storage\Geodata).
• Make sure the Standard and GPS modules are registered.
• Make sure you are in GPS Mode, and make sure Demo Mode is
the current active instrument