Re: Re: Tomtom sat nav gps with ipaq

[Dave McLaughlin <dave@xxxxxxxxxxxxxxxxxxxxx>]

Hi Patrick,

This is very normal for a GPS receiver. It has to download the almanac
and ephemeris data from the satellite constellation. Once this is done
and the data stored in the GPS, the subsequent fixes are very quick as
you noted. It continues to update this information whilst operational.

There is nice glossary here with descriptions of what I am talking
about...!!  :o)

http://www.gpsworld.com/gpsworld/static/staticHtml.jsp?id=8000

As an aside, you should note that the GPS will take much longer to get a
new fix if you have moved it more than 500 miles from it's last known
position whilst it was switched off. Again this is normal for GPS. Only
takes a few minutes though so not as long as the first fix downloading
all the data.

Regards
Dave...

---
Very funny Scotty, now beam down my clothes...!!
---
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http://www.embeddedcomputer.co.uk
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Patrick Lidstone wrote:

> Navigating
> The first time you turn the device on it takes a long time to first
> fix - a good half an hour in my back garden, anyway. Fortunately
> subsequent fixes take only a matter of moments (less than 30s I'd
> guess on average). To set up a route, you just key in the first five
>