What is the best personal position EPIRB I have been looking at the ACR Aquafix 406 with gps and the Mcmurdo Fastfix with gps. I have noticed that neither have a waterproof unit. ACR unit is submersible to 3 feet. The McMurdo is water resistent. I plan to have it as a safety device on my Boston Whaler. Any one have any experience with any of these units? Any help would be greatly appreciated. <img src="/images/graemlins/smile.gif" alt="" />