Pour les epreuves FAI uu peux utiliser au choix : - secteur FAI ou - cylindre 500 m : dans ce cas tu dois corriger la distance du circuit déclaré Ne pas mixer les secteurs pour un meme vol SECTOR OZ : This OBSERVATION ZONE is the airspace above a 90 degree sector with its apex at the WAY POINT. This sector is: a. For a TURN POINT, symmetrical to and remote from the bisector of the inbound and outbound LEGS of the TURN POINT, b. For a START POINT, symmetrical to and remote from the outbound LEG, c. For a FINISH POINT, symmetrical to and remote from the inbound LEG. CYLINDER OZ : This OBSERVATION ZONE is the airspace in a vertical cylinder of 0.5 kilometres radius centred on the WAY POINT. OZ CORRECTION : Each time a LEG crosses a CYLINDER OZ boundary, 0.5 kilometres shall be subtracted from the length of that LEG. This correction does not apply where FLIGHT RECORDER fixes are used as WAY POINTS in free distance record performances. Lire : http://www.fai.org/sporting_code/sc3.pdf