Vector Sensor Reference Manual
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6.8.2
$JATT,TILTCAL
The tilt sensor of the Vector Sensor can be calibrated in the field, however the Vector Sensor
enclosure must be horizontal when performing the calibration. To calibrate the Vector Sensor’s
internal tilt sensor, issue the following command.
$JATT,TILTCAL<CR><LF>
The calibration process takes about two seconds to complete. The calibration is automatically
saved to memory for subsequent power cycles.
6.8.3
$JATT,MAGAID
Use of the magnetic aiding feature is now required but for shipping purposes, this feature is
disabled. In addition to reducing the time required to compute a heading solution, it can also
provide a secondary source of heading when a GPS heading is not available. When you are ready
to turn the magnetic aiding feature on, there are two different ways of calibrating. The magnetic
sensor must be calibrated after the completion of the installation process.
To turn the magnetic-aiding feature on, use the following command.
$JATT,MAGAID,YES<CR><LF>
You may turn this feature back off with the following command.
$JATT,MAGAID,NO<CR><LF>
To query the Vector Sensor for the current status of this feature, issue the following command.
$JATT,MAGAID<CR><LF>
Note – Magnetic aiding is now always required.
6.8.4
$JATT,MAGCAL
Metallic structures on the vessel affect a compass’ reading, so this effect must be ‘removed’
through the calibration process. Once the Vector Sensor and antenna array is installed in its final
location, to use this feature, magnetic aiding must first be turned on, followed by its calibration. A
valid GPS heading is mandatory for the calibration process. There are two different ways to
calibrate the magnetometer.
The first way is to send a command to clear the current magnetic information to begin the
initialization process. Then, if you leave the Vector powered continuously, it will automatically save
the magnetic calibration tables when it is ready. This may take up to several days or even weeks
depending on the dynamics of your vessel. There is no further calibration required. If you wish to
check if the magnetic information has been saved, you can issue the following command.
$JATT,MAGCAL<CR><LF>
