U.S National Grid

Here are the links from the U.S.N.G. Each will open up in a new window.
Once you are on the Mission Manager site, at the bottom there will be a ‘Coords:’ dropdown where you should select ‘USNG’.
At the top, make sure the ‘Grid’ checkbox is selected.
From that point, you can zoom in up to a 100m grid. The pointer can provide 1m coordinates.

Mission Manager

USNG Homepage

Convert Lat/Lon to USNG

General Information

Florida Incident Mapper