just did some digging around on Maverick, it looks pretty cool and works fairly well even with the free version for just looking at maps offline.
check out:
Maverick - GPS navigation for Android with offline maps support.
Online Help: Maverick
List Of MapTilePacks - AndNavWiki
So let me see if I understand since I am going to Switzerland in a couple of weeks - I can download Maverick to my phone, create a map of the area I am in using Google Maps and then download this map to the phone. Then Maverick will track my position on the map?
So GPS on the Droid works overseas; it can actually access the Satellites over there?
i'm not 100% on the downloading of the map part. if you look at Maverick's site they reference a free program Atlas Trak or something where you can create your own .PNG maps. Alternatively I found MapTilePacks (3rd link) of maps already created sorted by country. And if you check the 2nd link, the help page, look under offline maps and it will tell you how to convert these to Maverick format so you can use these already created MapPacks.
I'm also pretty sure GPS will work anywhere and obviously shouldn't go over the cell network data plan (3g) or Wifi for that matter, just like in a car. hopefully someone else can confirm.