The calculation of the rotator position of the adapter at high altitudes (close to zenith) has been further improved. Especially any affect when passing the meridian at high altitude should now be very low. Formally we have a 5 degree limit around zenith where observations can be affected by tracking errors. In practise we normally quote 3 degrees, but even up to 1 degree there should not be any noticeable effect.

Thomas Augusteijn 2013-05-10