This ASM implements the Project 25 OTAR Changeover Command message.
Usage Notes
This message is sent from the Key Management Facility to the Mobile Radio (MR) to support the change of the active keyset(s) at an MR or group of MR.
This message instructs a MR to start using an already held keyset. Thus, this message must be preceded by a successful Modify Key transaction.
This message is broadcast as a non-addressed message, to reduce the message size, and to avoid issues from a relocated RSI to a different MMSI.
The “Subsequent Changeover” field is optional and unlimited per Project 25. In order to limit message size to 5 slots, the count of instructions is limited to 35 per message.
Version 0:
This is an RTCM compliant implementation of the Project 25 OTAR Changeover Command. This ASM only has an AIS Message 26 variant.