Downloading map data to local storage.

[glittah openmailbox org]

Hello,
    I just have an idea to improve Maps: the ability to download maps to 
local storage to conserve bandwidth later (if you're on a tablet, for 
instance).

This is a feature that would make a user more likely to use Maps instead 
of opening a web browser to Google or OSM since Maps would always be 
available for use because it wouldn't require an always-on internet 
connection.  Also, this wouldn't add much in the way of the config 
menu/option clutter, it could just be a button to download the map (w/ 
modal dialogue for radius?), and a config menu option set for when to 
use local data vs. fetching from OSM (and if/when to auto update the 
local map).  A visible icon might be shown if the map is known to be 
out-of-date.

A really cool feature for this in the future could be to download a 
delta for the newest map vs. the locally stored one when it gets updated 
to further save bandwidth (though you might not be able to do this 
directly with OSM).

Thanks for you time, and congratulations on the new release!
GLITTAH