Can anyone tell me if i can load a UK map in my australian bought
TomtomStart and use it in the UK? Or maybe the australian tomtom has a
different set of satellites to those in the northern hemisphere?

"M Phillips" <nospam-(E-Mail Removed)> wrote in message
news:4ddd20dc$0$11128$(E-Mail Removed)...
> Can anyone tell me if i can load a UK map in my australian bought
> TomtomStart and use it in the UK? Or maybe the australian tomtom has a
> different set of satellites to those in the northern hemisphere?

1. Yes.
2. Irrelevant.

On Thu, 26 May 2011 01:01:38 +0930, "M Phillips"
<nospam-(E-Mail Removed)> wrote:

>Can anyone tell me if i can load a UK map in my australian bought
>TomtomStart and use it in the UK? Or maybe the australian tomtom has a
>different set of satellites to those in the northern hemisphere?
>


Yes. The satellites orbit the earth and are not fixed, so you will see
the same satellites as everyone else on the earth.

Hello, Bob!
thanks - that would have been my guess, but i was not certain because of the
time it takes the tomtom to find the satellites again if you relocate a fair
distance- (say 1000km) with it off and then turn it on again.

On 26/05/2011 09:26, M Phillips wrote:
> Hello, Bob!
> thanks - that would have been my guess, but i was not certain because of the
> time it takes the tomtom to find the satellites again if you relocate a fair
> distance- (say 1000km) with it off and then turn it on again.
>
>
If your Tomtom supports downloading the Quickfix gps data (via Tt home)
that speeds up sat finding after a big relocate. Also make sure the
local time is set right

On Thu, 26 May 2011 01:01:38 +0930, M Phillips wrote:

> can load a UK map in my australian bought
> TomtomStart and use it in the UK?


Well, I loaded the S.Africa map in my UK TomTom and it worked find over there!
--
/\/\aurice
(Replace "nomail.afraid" by "bcs" to reply by email)

On 5/26/2011, M Phillips posted:
> Hello, Bob!
> thanks - that would have been my guess, but i was not certain because of the
> time it takes the tomtom to find the satellites again if you relocate a fair
> distance- (say 1000km) with it off and then turn it on again.

Unrelated.

The GPS (any GPS) has to know which satellites are currently visible at
the given time and place to find them quickly, otherwise the device
needs to do a blind search.

A device can extrapolate orbits to figure out what to listen for, but
the extrapolation gets worse over time, so the GPS has to eventually go
to the default blind search. Plus, if you have traveled more than a few
miles, the extrapolation fails because the device has no way to know
that your location has changed until it finds the satellites and can
get a fix. To top it off, getting a fix is a process of successive
refinements, which takes longer when the initial guess is far off.

Some devices have better extrapolation algorithms, and cell phones can
get their time and place from the cell network to get a good head
start.

I'm just skimming the surface, and also, I'm mixing visual and auditory
metaphors interchangeably here :-)

--
Gene E. Bloch (Stumbling Bloch)

On Thu, 26 May 2011 09:48:45 -0700, Gene E. Bloch
<(E-Mail Removed)> wrote:

>On 5/26/2011, M Phillips posted:
>> Hello, Bob!
>> thanks - that would have been my guess, but i was not certain because of the
>> time it takes the tomtom to find the satellites again if you relocate a fair
>> distance- (say 1000km) with it off and then turn it on again.
>
>Unrelated.
>
>The GPS (any GPS) has to know which satellites are currently visible at
>the given time and place to find them quickly, otherwise the device
>needs to do a blind search.

immaterial .. the GPS will find any satellites visible and get UT from
them. Then it simple for the GPS to calculate a fix, from which it can
then calculate local time



>A device can extrapolate orbits to figure out what to listen for, but
>the extrapolation gets worse over time, so the GPS has to eventually go
>to the default blind search. Plus, if you have traveled more than a few
>miles, the extrapolation fails because the device has no way to know
>that your location has changed until it finds the satellites and can
>get a fix. To top it off, getting a fix is a process of successive
>refinements, which takes longer when the initial guess is far off.
>
>Some devices have better extrapolation algorithms, and cell phones can
>get their time and place from the cell network to get a good head
>start.
>
>I'm just skimming the surface, and also, I'm mixing visual and auditory
>metaphors interchangeably here :-)

On 5/28/2011, Jack Simms posted:
>> The GPS (any GPS) has to know which satellites are currently visible at
>> the given time and place to find them quickly, otherwise the device
>> needs to do a blind search.

> immaterial .. the GPS will find any satellites visible and get UT from
> them. Then it simple for the GPS to calculate a fix, from which it can
> then calculate local time

Nah.

--
Gene E. Bloch (Stumbling Bloch)