Frequently asked questions
98-141779-G Chapter 8: Service 8-27
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7. Use the command help to show all available GMU commands.
8.8.2.17 Q17: The antenna is pointing in a wrong direction, what is wrong?
You have probably not made an azimuth calibration yet, or maybe moved the antenna
recently during a stationary test setup. Perform a new azimuth calibration.
Always use heading input when available on the ship. Only use gyro free mode when the
ship does not have a gyro installed. Use fixed heading when testing in the workshop.
8.8.2.18 Q18: How do I perform an azimuth calibration?
1. Go to ACU web server SERVICE - CALIBRATION.
2. Select User Defined satellite.
3. Type in the visible GX satellite longitude (55W, 62.6E or 180W), type in 19.707 GHz for
tracking frequency
4. Select GSC for satellite identifier
5. Click START.
The SAILOR GX antenna will turn +360 degrees in order to locate the Inmarsat GX satellite
and then calibrate the azimuth offset according to the BOW of the ship.
Figure 8-24: Azimuth calibration result
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