This allows us to work out which questions to ask you during the measure. If at any point you'd like to leave the form and come back to it later, pressing save for later will email you a link you can come back to for 30 days. Before you get started, you'll want; A Fibreglass measuring tape, a metal measuring tape, a set of calipers, a regular ruler. It will be easier to measure with 2 people, and you probably want to allow yourself 45mins to an hour to measure properly for a main.

All measurements are taken from the back surface of the mast. If you have an external mast track, they're still taken from the back surface of the mast, i.e. behind the external mast track. You'll want to have someone at the gooseneck holding a metal measuring tape against the back of the mast, and you'll want to take the numbers from the aft end of the boom. Make sure you've moved any boom bags or flaked sails so the tape measure can run straight along the top surface of the boom.