Ballast your boat with the same weight as the rig (often called a pig) so that she sits the same and everything in place as it would be when sailing (battery, Rx, hatch cover etc.)
Fill up the bathtub (yes, EC-12's fit in the average household tub)and put in the material of your choice, ANYTHING will work.. soap, DIRT, oil, the dog...(Asta gets in without being asked) and then set your boat in the water and leave it alone for 10 minutes. When you come back, lift the boat out carefully and vertically and it will leave the most perfect waterline of soapscum, dirt, oil, Asta-fuzz.. whatever you used... on your boat. Set it in the cradle and get your pencil. Trace the line and Voila! instant perfect waterline.
You would think that lifting it out crooked would be a problem, but it is much easier than it sounds. Try it, you'll like it.
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