Actually, I'm one of those volunteers who look for the emergency beacons when they go off(Civil Air Patrol) right now 100% of my 40 or so finds are false positives. Of those, 1 was a boat EPIRB in a storage warehouse, 1 was a broken FAA transmitter and all the rest were actual aircraft ELTs. Of those, probably 30 were on airports in aircraft which had not crashed. Some were hard landings, some were a mechanic accidentally hitting the switch, some were just going off because the contacts shorted out due to moisture. A couple others people had taken home or were in salvage yards. In most cases a 406 would have let someone call the owner directly and tell them to drive to the airport and turn off their beacon. For the remaining 121.5MHz beacons my life will be much more difficult, right now satellites get us usually within 10 miles or so. Without that, an airliner at 10-30k feet reporting an ELT will give us a HUGE area to search, and if we can't launch planes due to weather it's going to take us a very long time to find the source. In addition, if multiples are going off in an area, we may locate the one at the airport and not know until it's turned off that there was a second real crash somewhere else when we get another report of an ELT still going off. So, please upgrade if you can, and especially if you're going to be away from civilization.