suds wrote:

Here in
Hawai'i, it is very easy to be swept out into the open ocean. We carry a
gps, cell phones, and a vhf, along with extra water but obviously need more.
What is the group's opinion on various singling devices such as mirrors,
dyes, flares, strobes...?

If being swept out to sea is a possibility then one of the new Personal
Locator Beacons (PLBs) might be the thing to have despite the cost. They
work like EPIRBs but with shorter battery life and lower cost.

Are you able to anchor your kayak so it can't get blown away while you're
diving?