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The best explanation of how GPS works I have seen is at Trimble but this might be a little complex.


But running through it should give enough background to put an explanation together.


As for a presentation on caching... how about showing Simply Paul's countryfile video? There's a quicktime version here but someone might have a better copy for playing on a TV

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Ive got two powerpoint presentations i downloaded ages ago from the USA i could send to you 2.5MB and 1.6MB or i can PDF them across if file size is an issue they have some USA information in them email me at

mark dot davis at culina dot co dot united kingdom let me know which format you want and title the email "GPS presentation"



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