Posted by: RobG on Oct-28-12 10:22 PM (EST)
I have an old Garmin GPSMap76S (B&W model) that I might have to try that lithium battery trick in, once I find the cable so I can update the maps in it. But hopefully I'll pick up a newer Garmin Montana 650T in a few months instead.
I have an iPhone, and a waterproof case (Lifeproof) but you have to have bare fingertips to use the phone, and it's hard to read in direct sunlight. Add to that the fact that the battery goes quick especially when using it as a GPS, so unless you plan to carry some other power source with you or have access to A/C power to recharge, the best you'll do is maybe one day of paddling.
I've read in various places that salt water kills GPSes. Is that really the case, even the ones that are advertised as waterproof?