No matter what kind you get, no matter the claims for waterproofness, it needs to live in a dry bag for longevity. Open the dry bag between uses to keep down condensation. I have been keeping my Garmin 76Cx happy for years now. Bag can also hold spare batteries and a small nav notebook and pencil.
Cetus LV 2010
Nordkapp HS 1978
3 skin on frame West Greenland Kayaks