Autoland will squawk the emergency code 7700 on the transponder, and announce itself on the emergency frequency 121.5 and the local CTAF (common traffic advisor

Autoland will squawk the emergency code 7700 on the transponder, and announce itself on the emergency frequency 121.5 and the local CTAF (common traffic advisory frequency, IIRC, which coincides with tower frequency if the airport is towered).