if you are setting up and packing up each time, is it even possible to achieve an accuracy better than 1-2 arcmins (even with markers on the ground) ??
A reality check from my back-of-the-envelope calcs - to achieve an alignment error of ~2arcmins, the tolerance for placement of my EQ6 tripod on the ground is about 0.22mm with the legs fully retracted. Based on that I'd have my doubts about whether I could repeatably eyeball the mount placement any more accurately than that, even with markers on the ground.
