I have the Etrex Summit which is very similar to the basic yellow etrex. The best features of the etrex compared to other GPS units are that it is : waterproof, the smallest and lightest of any GPS, and relatively simple to use. Smallest and lightest help while hiking -- but don't matter too much in a boat.
As others said - learn to use it well before you need it.
You can learn a lot more about the etrex on the Yahoo groups site -
http://groups.yahoo.com and search for etrex. In the etrex group they have a lot of posts about use, tip/tricks, freeware/shareware/payware software for mapping and uploading and downloading, etc. Without a PC and software, all handheld portable GPS's are cumbersome to use for more than simple tasks.
I think most of the comments about battery life variation come down to temperature dependence of batteries. When it's cold - the batteries just don't last as long - for GPS's, headlamps, frs radios, etc. When the "dead" batteries warm back up - then they are useful again. For AA batteries - I think you get what you pay for -- that is --Kirkland batteries don't last as long as Duracell.
Good luck using your GPS!
Pete
[ 12-19-2001: Message edited by: Blind Squirel ]</p>