: I'd thought of
: using yard sticks (meter sticks?) so you'd have built in reference marks.

Maybe, but then you will have to set them up pretty tight. If they can move just a little bit sideways you are in trouble. I have made a backplate to hold paper, so I can just lift it up and start transferring the points to paper. That way I dont have to measure up the points when making drawings.

Gennie
www.byg-kajak.dk