Agree with Chris, satelite photos are no substitute for good maps. I was a bit imprecise, what I meant to say was that if you need absolute precision, you can identify objects from a map on the satelite images, then get a very exact position reading.
There are areas though where a map will simply be blank, yet the satelite images will make all the difference. With some serious misgivings on will work, I plotted a 240km route accross the great sand sea in Egypt using only the landsat images a few months ago. To my relief and amazement we made the trip I estimated to be at least three days in little over a single full day. Without the landsat photos it would have been at least three times longer, constantly backtracking from blocked alleys and getting stuck in bad spots.
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Happy Travels,
Andras
FJ Expeditions
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