These marks can be used as a channel entrance, centre line, mid-channel, or landfall buoy. The Western port Fairway buoy is a local example of this mark. The shape of the buoy can be a sphere, spar or pillar and is coloured with red and white vertical strips. The topmark, which is fitted, when practicable, to pillar and spar buoys, is a single red sphere. If lit, an isophase, occulting, one long flash every ten seconds, or morse ‘A’ (dot, dash) white light is exhibited. The buoy shape is optional but should not conflict with that used for a lateral or special mark.

Operators of vessels are cautioned that large commercial vessels may pass close by these marks.

Iso

Oc

L.FI.10s

Mo (A)