Mobaan
Re a using a GPS in North Thai / Lao - you wouldn't seriously use it for navigation, the maps are so bad. Only the main roads are on it & then they are sometimes kms out!
Generally there are no real trails or smaller roads, so I would not recommend buying one simply for navigation.
For me I use it for mapping & drawing my own maps.
On this board there are 4 other threads on GPS if you want to take a look & get some more info & ideas.
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Hope this is a help.
Davidfl
Keep The Power On