PNI SeaTRAX - Manual (Page 19)

PNI Sensor Corporation DOC#1018154 r02
SeaTRAX User Manual Page 14
Before proceeding with a calibration, ensure the SeaTRAX is properly installed in the host
system. The device should be installed as discussed in Section 4, and the software should be
properly configured with respect to mounting orientation, Endianness, north reference, etc.
Section 6.4 outlines how to perform a calibration using Studio, while Section 7.3.10 provides
a step-by-step example of how to perform a calibration using the PNI protocol.
5.1.1 Full-Range Calibration
A Full-Range Calibration is appropriate when the SeaTRAX can be tilted ±45 ° or more.
This method compensates for hard and soft iron effects in three dimensions, and allows
for the highest accuracy readings. The recommended 12 point calibration pattern is a
series of 3 circles of evenly spaced points, as illustrated in Figure 5-1 and listed in Table
5-2. The pitch used in the second and third circles of the calibration should at least match
the maximum and minimum pitch the device is expected to encounter in use.
Figure 5-1: 12 Point Full-Range Calibration
Note: While Figure 5-1 shows the location of the device changing, this is for illustration purposes and it is
best for the location of the device to remain constant while only the orientation is changed.