I just bought a Mach1GTO for my de-forked C11" and am still feeling out how the mount works. I also bought the RAPAS for PA. The scope is balanced and it is leveled in the E/W direction.
I did an initial rough PA and then used the RAPAS and the app to complete the fine alignment. Using my UltraStar camera at f/5, I did a drift test on Sirius as it was low in the southeastern sky and it remained centered for 5 mins before I noticed any drift. Then I did the same with Menkar just off the meridian and near the celestial equator and it only stayed centered for about 1 and a half minutes. I then looked once again on the RAPAS and Polaris seemed spot on compared to the app. So, I am concluding from this that the RAPAS needs to be realigned as AP suggests could be the case.
My question: What is the simplest and best way to do the drift alignment which I have never done?
I am a Mac user and I am aware that AP highly recommends PemPro which is a Windows program vs. doing the drift alignment manually. I also realize that the simplest and best ways may not be the same. I do have an Intel compute stick with Windows 10 if folks think PemPro is the way to go.
Thanks in advance,