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HMR3500 User's Guide
"Result". The lower the figure of merit the better the compass can compensate for disturbances. Results of 200-300 can
be considered good. The Abort button will change to OK when the process is complete.
The rest of the compensation process is done by the compass automatically. If the results of the computation phase are
satisfactory, the compass automatically loads the coefficients into its non-volatile memory and will use them for future
corrections until changed. If, for any reason, it is necessary to abort the process, click on the "Abort" button. This will send
the corresponding command to the compass and remove the display.
Abort
If it is necessary to abort the compass magnetic compensation process, this is normally done with the button shown
in Figure 9. However, if necessary, the abort command can also be sent with this menu choice.
Revert
Sending the revert command deletes any user-performed magnetic compensation, restoring the factory values which
were done without nearby magnetic disturbances when the unit was manufactured. Any successful compass
magnetic compensation will overwrite a previous compensation, so normally there should be no need for the revert
facility. However, it could be helpful if, for example, you remove the compass and use it in a different environment.
Help
Apart from menu and button explanations in the status bar, CompassHost has no on-line help at this time. Please
refer to this manual. The help menu will display version and other information.
Data Logging
If a log file is open (see Log File, on page 18 for information as to how to do this), CompassHost will write extensive
ASCII data from the module to a file. The primary source of information for logging is the DORIENT messages,
supplemented by DINICAL and DIMVAR. DORIENT messages are output by the compass spontaneously.
4.15 Description of File
Data in the file is fixed field, separated by spaces only. There are no tabs, commas, or other delimiters. Each session
starts with a date and time stamp and a header line to identify the columns. This header line is 103 characters as are the
data lines themselves. The columns are listed below.
WinTime
Local time, hour, minute, and second as supplied by the Windows operating system.
Azim
Azimuth in degrees as determined by the compass with all corrections applied.
Pitch
Pitch attitude in degrees as determined by the compass.
Roll
Roll attitude in degrees as determined by the compass..
MOfst
Mounting offset in degrees. Although the compass treats this correction as a constant, it may be changed by
command while the module is operating.
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