How close does the headsail tack, luff spar or boom swivel need to be to the centreline for compliance with A CR 8.4 (b)(2)

The word ‘approximately’ appears to introduce some latitude in the placement. As most boats are asymmetrical to a greater or lesser degree, making it impossible to define a centreline precisely, the requirement is that the attachment shall be approximately on the centreline.

For the same reason, it is impractical to state a maximum distance within which the attachment shall be made.

Generally, an attachment within 5 mm of the centreline will be compliant. Where a hull is conspicuously not symmetrical, this figure may be larger.