[ILUG] SatNav advice

[Kevin Philp]

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.

Kevin.


Ronan Mullally wrote:
> 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
>