How did Morgan get to Alexandria

To my recollection he was using a map that Rick had that was been going to washington-dc not Virginia that map was from when they still were trying to get Eugene where he wanted to go so how does Morgan end up in Alexandria
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Trying to upload the picture but it won't let me
http://www.nerdcoremovement.com/wp-content/uploads/2014/10/Walking-Dead-4-Walls-and-a-Roof-3.png
There we go, that works
> But how did he even get that far on a map that shows how they were going to Washington DC not Virginia
Have you looked at a map before? Alexandria is on the way to DC