In the fast-changing, and market-sensitive world of GPS purchase, I thought I'd sound the experts here on what device I should investigate for an upcoming adventure.
My wife and I we'll be walking through Germany, Switzerland, Lichtenstein, and Italy on various pilgrim routes (Erfurt to Rome if you want to know). These are sometimes on roads, trails, paths, and only once in a very wild area, while crossing the Alps. We're following parts of the Via Compostela, and the via Francigena, all of which have published GPS tracks.
Here's what I need the device to do, in order of importance:
1. Track progress. We will be publishing our progress; It doesn't need to be moment-by-moment, but that would be nice. (The Spot device does this, but so does www.instamapper.com).
2. Map photos, videos, interviews. I need to be able to sync track info with photos taken, in one fell swoop, as well as keep track of other events (will be carrying a netbook as well). My preference is for more accurate than not; I want to be sure there's full functionality in Europe (I'm not sure if there are lingering tech differences between the two sides of the pond).
3. Navigational aid. The routes are posted haphazardly, and it would be nice to have help when there are multiple possibilities to decide between. I don't really need the device to follow the perfect route, or pinpoint accuracy, just as a crutch; and since the routes are already "established," why not?
Of course, the lightest option would be the best. We will be within 3g networks most of the time and so able to use google maps, etc. The iPhone is attractive, but complicated due to the costs of using various networks, especially for unlimited data. There's also, then, the problem of its notorious power-hungriness. I'd like not to have to recharge it twice a day.
 I'm not opposed to the cell-phone alternative, but I'd like other options as well.
All of your collective wisdom, experience, and insight are welcome.