In article .com,
Chuck Gould wrote:

The compiled results of a few weeks' research into recommended MOB
prodecures from a variety of sources.......
....
In dark or foggy conditions, or in confused seas, it may be difficult
to maintain visual contact with a MOB. Professional mariners equip
PFD's with whistles, to allow a MOB to assist in establishing his or
her location relative to the rescuers. Adding a whistle to every PFD
onboard is a relatively inexpensive upgrade to most standard issue
life vests. Small flashlights or strobe lights suitable for signaling
position after dark are available beginning at prices under $15, and
even an iridescent "glow stick" would be better than no visual
indicator at all. Of course, if the MOB isn't wearing a PFD then an
arsenal of whistles and signaling devices attached would be of little
use.

The following article has some info on electronic devices that help from
the pratical boat owners magazine.
http://www.wavefinder.ch/en/presse/d...OtestNov04.pdf

Their own product seems to be simple and practical.
http://www.wavefinder.ch/en/
Ship chandlers over here started offering this device built right into
the PFD.

...In the cold waters of the Pacific Northwest, a speedy response is
crucial. Hypothermia will render some body types unconscious in less
than 30 minutes, and may seriously impair a victim's strength and
ability to assist in his or her own rescue in substantially less time
than that. A deliberate, thoughtful, properly rehearsed approach will
normally make effective help available faster than hasty panic. ...

Fully agreed, I would just like to emphasize how quickly hypothermia
strikes - 30 minutes seem to be rather optimistic in many cases, even in
warmer waters.

Marc

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