"I own the McMurdo FastFind. At the time it was the smallest and lightest. ACR has a smaller one now. I've never had to deploy it so can't "recommend" but I do have confidence it would work if it needed to. It's got a self-test feature"
+1 Except that I run thru it every spring, just to be sure.
"At 5 years I'm supposed to return it to McMurdo for a battery replacement. At that point, technology will probably have come far enough that it will be more likely I'll buy a new PLB."
+1 the new battery costs something like $70. :( Time to move on.