KVH Industries FB250 User Manual page 168

Chapter 4: Using the web interface
The TracPhone terminates all ongoing connections and deregisters from
the current satellite before registering on the new satellite.
Note
If you have selected a satellite, your TracPhone system will only try to
establish a connection to the selected satellite. This means that if the
antenna is outside the coverage area for that satellite, the TracPhone
system will not be able to register with the BGAN network.
154 Selecting the preferred BGAN satellite