>So the general idea is
>1) they need an unrestricted view of the sky
>2) you have to leave them for a while to get a fix on
>the satellites- 5mins? 10 mins? longer?

Well these two factors are common to any and all GPS units. Typically thay
will not work inside a building because the building materials have too high
an absorption at the 1.5something GHz they use, and it takes a while for the
receiver correlator to lock onto enough satellites in view to obtain an
accurate position fix.

From a cold start, most documentation seems to talk in terms of 10 minutes
to get an accurate fix, but if it is possible to feed the receiver some info
about its current position first, then this can be reduced.

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