Moog Crossbow NAV440 Series - Manual (Page 56)

Page 56
NAV440 User Manual
7430‐0131‐01 Rev. F
After completing the alignment procedure, the heading accuracy should be verified with all third party systems
actively using a known reference such as a compass rose, GPS track or a calibrated compass. Heading inaccuracies
greater than the values specified on the data sheet or fluctuating heading performance may indicate magnetic field
disturbances near the unit.
NOTE: An acceptable calibration will provide X and Y Hard Iron Offset Values of <0.1 and a Soft Iron Ratio >0.95. If
this procedure generates calibration parameters significantly outside of this range, the system will assert the
softwareErrorÆdataErrorÆmagAlignOutOfBounds error flag. Refer to Error! Reference source not
found.Built In Test (BIT) for details about error flag handling.
For more information about magnetism, including hard iron and soft iron effects, refer to Chapter 4. Magnetometer
alibration and Alignment Guidelines on page 39. C
NOTE: The alignment does not correct for time varying fields, or fields created by ferrous material that moves with
respect to the unit.
Alignment Instructions
NOTE: The 440 Series does not support external magnetometers; aligning or leveling an external magnetometer
does not apply to a 440 Series unit.
1. Click Configuration and then select
Magnetometer Alignment fr drop om the
menu.
2. The Magnetometer Alignment dialog
window opens. Ensure Internal Mag is
selected.
3. If the 360 degree turn can be completed
within 120 seconds, check Auto­
e Terminat .
4. Select the Start button to begin the
alignment. Follow the instructions
displayed in the screen. Refer to Figure 19.
5. Rotate the unit for 380 degrees of rotation
or until the message is displayed that
alignment is complete.
Figure 19Magnetometer Alignment Dialog