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Pete,
EQ Align enables exactly that - software assited polar alignment, WCS is another but EQ Align is the most spohisticated I have seen helping you select the right part of the sky to work in and slewing your scope to the target. It also enables you to measure PE.and guide using a PID control routine, something I have wanted to try before so I think it has a lot of potential I just need some time to work with it.
Other apps have routines that can help - eg GuideMaster. Still others can help with drift alignment by graphing errors (eg K3 and PHD).
Rabbit, yes it will show you graphically how far off you are and the adjustment required for correction.
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