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Thats correct, there's the 3 levels of GPS, standard (L1), dual frequency (L1,L2) and Mil spec, which uses something else.
Dual frequency GPS is much better on position, but as is to be expected much more expensive. The Mil spec stuff I beleive my old work used to make it in another part of the empire, but never got to see it myself.
Then again you can use Glonass to get a better position, don't think it's setup enough for a stand alone position, but used with GPS it'll give you a lower error.
MiniG
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