Probably overkill for you, but always good to know... this is it: http://www.trademe.co.nz/motors/boat...-562181416.htm
Essentially, a person version of the type boaties use. Register it to yourself (with your details). Activate when all hell breaks loose and it will pin your location down, and send details to the rescue centre. They then contact the registered numbers, to try and establish if the activation is accidental or not. If not, then a chopper is usually dispatched to locate and assess the incident.
Not quite the same, but another option is Spot: http://au.findmespot.com/en/
Did a blog evaluating equipment here: http://www.kiwibiker.co.nz/forums/en...829-09-2011%29
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