ANSWER:
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the Breitling chronographs. (wristwatch). There a few models that have been made for over 15 years, with a 121.5 mhz emergancy beacon transmitter built in.
http://www.breitling.com/en/models/professional/emergency/
Other: Miltary style,
http://www.gdc4s.com/content/detail.cfm?item=a001a1c6-04dc-4aae-a080-910c2709cd77
Originally published at https://warintel.blogspot.com/2007/05/personal-gps-locator-emergency-beacon.html on May 31, 2007.