On Wed, 21 Jan 2009, Gerry Boland wrote:
> I read an interesting article on the technology of GPS:
>http://arstechnica.com/articles/paedia/assisted-gps.ars>> It seems to imply that the more advanced GPS units have smarter algorithms
> for determining its position as fast as possible, i.e. on turning on the
> unit, when the satellite positional data has not yet been received, it
> extrapolates where it expects the satellite to be from previous data and
> uses that approximation to calculate immediate coordinates.
This is not exactly new. My TomTom has been had that feature for several
years. You need to update the ephemeris data every now and then to keep
it on top form.
Shame the TomTom maps of Ireland (I bought it when living in the UK) are
so woeful.
-Ronan
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