It worked for us one night...we were hanging off a sea anchor in 6000+ and were all asleep, when the alarm went off ( I think it was set at a mile or 1/2 mile) and it got us up to greet a US Navy support ship of some kind came within 1/4 mile and put a spot light on us for a few seconds then turned and went away. It turns out that a submarine was doing some kind of exercise and they were checking the area. It was a little nerve wracking initially to see a boat in the middle of nowhere approaching on radar...We had turned on a load of lights after the alarm went off. We spoke to him on the radio for a minute afterward...then went back to sleep.
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