Vector Sensor Reference Manual 92
The second method requires more work up front, but, ensures your magnetic calibration
information is up to date and complete within a short period of time. A command to clear the
current magnetic information must first be sent to begin the initialization process, followed by
slowly rotating the vessel a full 360° approximately 3 to 10 times. Calibration should be
performed in a clear environment without any potential satellite blockages to minimize any possible
errors during the process. The command to initialize the magnetic calibration process follows.
$JATT,MAGCLR<CR><LF>
Once the command has been issued, the vessel needs to rotate 360° three to four times. The
following command can be sent during the calibration procedure to ‘ask’ the Vector Sensor if the
calibration is complete and if so, to automatically save it to memory for subsequent power cycles.
$JATT,MAGCAL<CR><LF>
If the Vector Sensor enclosure is reinstalled in a different location, even on the same vessel, you
will need to clear the calibration table with the $JATT,MAGCLR command and complete the new
calibration. Similarly, if any objects containing metal are moved near or away from the sensor, this
command will need to be sent to the receiver and a new calibration performed.
Note - It is very important to perform the calibration only after the installation of the
Vector Sensor has been confirmed to be complete. If the Vector Sensor’s location is
changed, you will need to clear the calibration and recalibrate. A valid GPS heading is
required during the calibration process.
6.8.5 $JATT,MAGCLR
This command is used to clear the magnetic calibration table inside the Vector Sensor’s memory.
It is issued in order to begin the process of calibrating the Vector Sensor’s internal magnetic
sensor. This command has the following format.
$JATT,MAGCLR<CR><LF>
Once the command has been issued, you have two choices for calibration. You can either leave
the Vector powered continuously and the magnetic aiding feature will automatically save the
settings after a period of time, or you can rotate the vessel 360° 3 to 10 times.
If you choose the second calibration option, the following command must be sent after the
calibration procedure to ‘ask’ the Vector Sensor if the calibration is complete and if so, to
automatically save it to memory for subsequent power cycles.
$JATT,MAGCAL<CR><LF>
If the receiver responds with a negative, continue rotating and re-issue the MAGCAL command
periodically until the calibration has been accepted.
If the Vector Sensor system is reinstalled in a different location, even on the same vessel, you will
need to clear the calibration table with the $JATT,MAGCLR command and complete the new
calibration.
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