Some HNSKY screen shots of Messier objects using the new astrometric catalog USNO UCAC4 , GSC-ACT and USNO A2:

The latest UCAC4 at M8. It is not prefect, notice the streak stars patterns:

The latest UCAC4 at M13:

M11,  left with GSC-ACT, right with the UCAC2:

M11 with USNO A2:

M6,  left with GSC-ACT, right with the UCAC2:

M6 with USNO A2:

M4,  left with GSC-ACT, right with the UCAC2:

M4 with USNO A2:

M2,  left with GSC-ACT, right with the UCAC2:

M2 with USNO A2: