Speaking as someone who accidentally went to Columbia Heights last time I was in Washington DC (the response from my host was an anxious "are you all right?") partly because I couldn't find the tube map, the tubemapwallet by SuckUK looks like a totally brilliant idea. Except from the fact that it means your wallet will eventually be obsolete, and you'll end up going to Cheltenham in the middle of the night. But until then, it'll be bliss. [GT]
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