Gregory, a few observations:
- Does the Holux allow you to change the datum it uses? Google Earth uses WGS-84, but many maps around the world use a different datum, often a local one. If your GPS doesn't allow you to match the datum the map is drawn to, it could cause navigation issues. Often it's not a huge deal, but it can cause major confusion if you don't know it's going on.
- Does the Holux use a high sensitivity GPS chip? Garmins do, and this is what you want when dealing with tree cover or canyon/cliff areas. The Garmins seem to do a good job dealing with the multipath errors common to canyon/cliff terrain.
- Since you only need the GPS to give an occasional point position, a Garmin ForeTrex 301 or 401 would literally provide months of service on 1 set of AAA batteries, especially if you use lithiums. The battery life is so long, and two AAA lithium batts so light, I would just discount the AA/AAA disparity.
If you stick with the Holux, I think you're giving up a lot of capability to maintain battery size consistency.