Rotormat:
I thought we worked to FAA reg's for most things to keep us aligned with ICAO. Must not in this case?
That was a humorous remark - right.
I think you have confused some on this thread - the equipment you mention is a standard RADALT with an AVAD: two settings are available; that which is set by the pilot; and the factory preset warning (in the UK set to 100'). The first gives "check height" and the second "100 feet" (or whatever is the factory preset).