Originally Posted By: KenK
BUT - from comments given in forums - their view is that the SPOT can also be used in an opposite way. The user communicates an OK message on a regular basis, and it is pre-arranged that the ABSENCE of an OK communication signal indicates that rescue is needed. Supposedly the family/friend can use the previous location reports and the trip plan to estimate the user's location. This makes me wonder about how large that search area could be if backpacking, or canoeing (ala BWCA).

Of course the problem with this later method is that a lost or malfunctioning SPOT can result in a false rescue attempt.

The other use of the 'OK' button that I've read of is for letting those at home know that everything is okay when you are simply behind schedule. This use could prevent an unnecessary SAR mission if you are simply delayed but not in any real danger.
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Victory awaits him who has everything in order — luck, people call it. Defeat is certain for him who has neglected to take the necessary precautions in time; this is called bad luck. Roald Amundsen