A GNAV is a fixed aluminium compression strut fitted between a hinged or fixed fitting on the aft side of the mast and a slider in the sail groove of the boom. Available for both dinghy and keelboats. The sail must be loose footed as the sail groove is occupied by the GNAV slider. A strap from the slider is lead down to the cockpit. When the strap is tensioned, the slider moves forward and the boom is pushed down. Release the strap and the mainsail will lift the boom.
The GNAV dinghy (SLD02502510) and GNAV keelboat (SLD03803820) systems replace your traditional vang kicker by replacing the locaction of the thrust upward allowing for more room in the cockpit for tacking. When GNAV is used, boom must not be allowed to rotate.
GNAV (or upside-down, reverse thrust vang system) provides the ultimate solution for extra room and quick tacking. The GNAV's are very popular for both racing and recreational boats due to the huge gain in cockpit space made by removing the conventional vang kicker. Lightweight, efficient and very strong, it offers a multitude of options for controlling boom thrust and increasing cockpit space.
The boom inboard end must be SLD50907802. Bracket part numbers: SLD50842614 & SLD50827314 are for use with new type boom inboard end SLD509081xx. If SLD508273/737 GNAV bracket is used, the sail entry top must be at least 240mm above bracket center. The standard GNAV assembly SLD02502510 includes strut and slide. When using this, the distance between boom bracket and GNAV bracket center is 590mm.
Triangular toggle for GNAV system
Side attachment GNAV fitting incl. drop nose pin
Drop nose pin
New GNAV inboard boom end with integral sheaves for gnav and reef lines
GNAV end fitting
Stainless steel GNAV end
GNAV car including sheave and clevis pin
Old style GNAV inboard boom end
GNAV strut & slider
GNAV mast bracket, side fit, stainless steel
GNAV mast bracket, standard fit, stainless steel
GNAV mast bracket, standard fit, stainless steel, drop pin
GNAV mast bracket, old type, heavy duty, stainless steel