ELT Types
Quite a few ELT types as I understand it.
Automatic/Fixed
Automatic /Portable
Survival/Portable
Survival.
Personal
Most now give GPS position but the most basic don't. Those dedicated to a particular aircraft normally registered to it by serial No. so the aircraft is identified by it's ELT's serial No. In practice there have been issues. In my company in the early days of fitment it wasn't unknown to get a phone call to let us know that one had been activated in error but unable to identify which. This was suspected to be caused by water ingress. The ELTs (helicopter bait) were moved to a drier location.
Hope you never have to use yours!
See you on the ground.