Nautilus LifeLine Marine GPS and Silicone Pouch w/ free Coil Lanyard (Orange)

This is a great size and I love the idea of having something on my body if I go overboard alone. I spent a lot of time figuring out the whole deal on MMSI and how to test it and unless your boat has AIS you can't test it. The confusing thing is that this device has an MMSI assigned to it and printed on the outside, but that's not the MMSI that you're supposed to program. They want you to program the MMSI of your boat so the message gets sent there for the first 20 min. If this is a dive boat then great, but you'd have to program it for the MMSI of each dive boat which is impractical before every dive. If it's your boat and you're single handed then it wastes 20 min sending the signal to your boat before signalling other boats so you're dead in cold waters. If you do program it for your boat then you can do a test and send the signal ONLY to your radio - I've seen Youtube demonstrations of this. But the company recommended for my circumstance to NOT program an MMSI at all so it goes out immediately to all vessels in the area. But without an MMSI it's impossible to test it without finding a large vessel with AIS who will help you, which is again impractical. There are two tests - hold 5s for a single position report, 8s for a continuous position report. These only broadcast AIS and not the DSC that most boats receive. There are websites which report real-time AIS but I found they don't show the position for these devices and the company said there are different class alerts and they don't have to show them all. The actual distress button should issue a DSC and AIS alert to nearby vessels but it's illegal to test that and Coast Guard would immediately repond. So it's basically impossible to test the real-world conditions of not having an MMSI programmed and you just have to trust that it will do the right thing when you need it.

I purchased 2 units in January 2020 from Nautilus vendor at the NY International Trade Show. We have made about 180 dives going to Caribbean locations. Deepest dive was to 147'. I had to change battery on mine after about 100 dives, and removed, lubricated with silicone and replaced back the "O" rings. My wife's unit worked flawlessly until last week when after 3 days' diving we found her unit flooded and never being opened since original battery placement. I had checked her functioning on our first diving day and blue light and yellow light checked out. On third day unit did not work and when opened it was corroded (see pictures with batteries removed).We have thankfully never had to use these units, and would have had only 1 working if we were together and needed them. On safety note we carry each a Surface Marker Buoy, reel, loud whistle and First alert sound device attached to BCD inflator. Nautilus was life saving last resort...****I have taken photos and contacted Nautilus via email today and we will see....Although after 1 year warranty period I would expect replacement for a life saving piece of equipment. They have not specific instructions for maintenance except: "Ensure that the O-rings are always clean and free of contaminants."