Street map tiles should be cached for a year, if the user's cache 
settings allow it, but the &v=ap.88 parameter in the URL changes 
whenever there's a new tile release, so the new tiles get fetched.

Satellite tiles are also configured to be cached for a year, but their 
URLs contain a &cookie parameter, like 
&cookie=fzwq2ot2pambCLFzjrK8HQ06SRHYSxPPz6rrU, which changes each time 
you start a new browser session. So a new tile gets fetched. If you 
regularly visit the same satellite map tile, there could be many copies 
of the same tile image with different URLs. Your browser has no way of 
knowing that URLs with different &cookie parameters are actually the 
same image.

I've no idea why Google do that. The tile servers will happily serve the 
tiles without the &cookie parameter.

-- 
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team


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