I'm setting up an EQ5 with drive for the first time, and having similar problems. I used a compass and found my house had been built to what appears to be true north south.
But when I took a few photos I still had problems, I took two shots. The first a stationary shot got me intentional star trails 38mm long. The second with drive engaged got me trails 8mm long. Both were time exposures of about 35min.
My question is is this due to DEC or polar alignment errors (or both).
Regards
Roger Cooper
