[ILUG] SatNav advice
kevin at cybercolloids.net
Wed Jan 21 20:59:31 GMT 2009
I was told that the basic Tom-tom system (UK/Ireland) used a different
mapping source from the Tom-tom with a full Europe map - and the Europe
wide map was better for Ireland.
Could be nonsense but I bought the Europe wide version.
Ronan Mullally wrote:
> On Wed, 21 Jan 2009, Gerry Boland wrote:
>> I read an interesting article on the technology of GPS:
>> 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.
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