Hi:<br><br>Here is a good web site to discuss GPS units: http://www.geocaching.com/<br><br>If you click on the "discuss geocaching" link from the main page you will find a section on GPS hardware. The folks there have a lot of combined experiance with many brands and models. <br><br>My personal favorites are those made by Garmin that are built for marine use. I've used my GPS II (no longer made) in the pouring rain with no ill affect on the unit.<br><br>One more thing, if you are going to use GPS in a jungle you will definitely need an active antenna to boost reception.<br><br><br>Chris