You are moving out of the footprint of your chosen satellite.

Your chosen satellite comes in shadow of buildings or terrain (and

you can still see another satellite).

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Figure 8.6 (from ALRS Vol. 5)

Satellite AcquiSition -IOR - (assuming ships head 0000 or assuming your equipment

can adjust automatically for ship's head, once entered by the operator)

Example 1 - Vessel 'A' requires Azimuth 260 Elevation 15 to hit the satellite.

Example 2 - Vessel 'B' requires Azimuth 080 Elevation 15 to hit the satellite.

Antenna Radiation Hazard (Inmarsat-A, Inmarsat-B, Inmarsat-M IMini-M)
All transmitting antennas generate hazardous radiation. In the case
of Inmarsat-A, Inmarsat-B and Inmarsat-M/Mini-M, the extent of the
hazard is a factor of:

168 THE NAUTICAL INSTITUTE