Big gennaker

The big gennaker or the Mast head 0 (zero), is a large gennaker tacked to the bowsprit going to the top of the mast. This sail is fixed on the "jockey poles" which are a kind of "arms/outriggers" to project the sheet away from the hull of the boat. It measures nearly 300m², the equivalent of 1.5 times a tennis court. It is a fairly hollow sail that is used mainly in light airs.