My first GPS was a Garmin and I didn't like it. So I gave it to my son and bought a Lowrance H20. Once I learned to use it I really liked it and decided to upgrade to the color unit. That was a mistake as it was very hard to see in bright sunlight. Back then Linda Colt worked for Lowrance and was a fantastic person to work with. She said they had a lot of complaints about viewing in bright sunlight. I wound up trading the color one and went back to the B&W. She gave me a copy of Lowrance's Map Create to make up the difference in price. I was going to sell the H20 a while back but decided to keep it for a back-up. All this goes back to when they first came out with them and it still works great. But I seriously doubt it floats. Not sure I would any more.
Fair Winds and Following Seas
Bill H. PTC USN Ret
Chesapeake, Va