There used to be a `get -out-of -jail card`,called a standby AI/AH.Usually a 4"diameter representation of the outside world and a 3 position switch annotated `ON`/off/EMERG`,powered by the battery,and a small emergency battery,in case the `battery` failed,after everything else.A length of coloured cord on the windscreen also helped..Cost...next to nothing in a million-$ helo...Don`t they have those any more...???