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Most (all?) PDA style solutions lack ... especially the accuracy required for geocaching

Can you tell me more about this? I was under the assumption that all GPS receivers would be equivalently accurate. Is it an issue of being able to acquire fewer satellites, or is there some sort of fudging in the interpretation of the data that some do better than others or what?

I don't suppose I really have any need to know this stuff, but am just interested in why one would be more accurate than another.

Ah. I see Redrum's post about an external antenna helping, so it must be the satellite acquisition, right?
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Bitt Faulk