+x pilot-byom - 8/23/2020 11:54:46 AMI never heard they used the telephone number from the flight plan to do a rescue search. Usually this number is the number they call you for a pre-flight briefing if requested. I find it useful not to auto-fill the number known by Skydemon. The GMDSS rescue procedure usually starts with a telephone call to your destination airport and if they don't get confirmation you landed there, they initiate the automatic rescue chain, which uses the emergency numbers of the GMDSS system registered for your aircraft (typically from the ELT registration). I was told this is done because the telephone information off the flight plan is not passed to all relevant stations.