[whpalmer4]

I took the OP's question to mean that he wanted to look at the list in map view (which is like context mode, except sorted by distance from your location), and have it only show nearby contexts, according to his definition of "nearby".

With this interpretation, one can move easily on to the OP sitting in his office on lunch break, wondering what could be accomplished with a quick errand, a question which is not easily answered with the approach you mention.