This action makes minor adjustments to the boundary descriptions of restricted areas R-2516, R-2517, R-2534A and R-2534B; Vandenberg AFB, CA. The changes are necessary as a result of the FAA using updated digital data that defines maritime limits and other geophysical features used in the boundary descriptions. This requires minor changes to certain latitude/longitude points in the boundary descriptions of the above restricted areas to match the updated digital data.