I have an AP900 mount and use the AP APCC software to control it as well as SGP.
I cannot get SGP to plate solve correctly any more and I always seem to by off by about 10-15% of the Width/Height of the image in both Dec and RA. Luckily I bookmark my star guide position in PHD2 and can manually return to the same position.
I have tried to change to J2000 in both the SGP Plate solver parameters and in APCC but still no luck - or should SGP be J2000 and APCC as JNow?
Can someone using APCC and an AP mount advise on what the settings should be in APCC and SGP?