Hi Matt and others
A little trick I used was to do an accurate Drift Align at your usual or most used site, then get a marker pen and mark onto the mount the actual latitude at the pointer then get a Dremel or similar and scribe that spot. If you know the latitude of that location then it is a simple matter of laying off an appropriate distance and do another Drift Align when you go somewhere else.
Matt
Have a talk to Spearo, I went up and showed him how to Drift Align, you might want to go out and talk to him, failing that, when I go up there next time I can run you through it.
Cheers
JohnG