Mainsail

All New Mainsails - Must be measured and reported regardless of the backstay!!

Existing Mains - As of 2016, all mainsails must be measured. Certificates will be marked as "Measured or Unmeasured". If marked as unmeasured, owners risk protest to prove the sail is not oversized.

3 measurements are required when applying for a certificate.

(MGT will be required in as early as 2017, so this 4th measurement will also be required)

Headwidth (HW): the maximum width (or projected width) of the headboard.

Main Girth Top (MGT):the length of the girth of the mainsail taken at the 7/8 point of the leech (from the clew) to the nearest point on the luff.

Main Girth Upper (MGU): the length of the girth of the mainsail taken at the 3/4 point of the leech (from the clew) to the nearest point on the luff.

Main Girth Middle (MGM): the length of the girth of the mainsail taken at the mid-point of the leech (from the clew) to the nearest point on the luff.