From Wazeopedia
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This is a bookmarklet which will take the coordinates from the '''center''' of your screen WME window and find the appropriate CRS Grid map. Occasionally you may find a bit of inaccuracy at the edge of a grid, but in general it should put you in approximately the correct place.
The script includes some rough boundary checking to make sure you're in California, as the state hasn't been magnanimous enough to provide FC maps for OR, NV, AZ or MX.