How do people manage their maps? I won't be using the 770 'online' whilst on the road and therefore want to predownload as much as possible. I've tried doing a download along a popular route (Plymouth to London) but it was taking so long I had to cancel it.

Is there a better way to predownload? Is it possible to get all maps for the UK? If so how big would that download be?

Lastly are there any tips for the optimal zoom levels to download?