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[Edit Description]
When the location you want is in the center of the map, click the bookmarklet.
A little dialog box will pop up displaying the coordinates which can be copied and pasted for use elsewhere. This code can be bookmarked and then used in the future by selecting the bookmark.
Source (distlib.blogs.com)
[Edit Javascript]
Show Source Code
javascript%3Avoid%28prompt%28%27%2520%27%2520%2CgApplication.getMap%28%29.getCenter%28%29%29%29%3B
lat long google maps google maps coordinates
