Declination is the angle the direction makes with the $z$-axis, so is therefore 0° for the positive $z$-direction, 90° for any direction in the $xy$ plane, and 180° for the negative $z$-direction.The positive $x$-axis direction therefore has azimuth = 0°, and the positive $y$-axis direction has azimuth = 90°. Azimuth is the angle from the $x$-axis to the projection of the direction onto the $xy$ plane.In other words for these directions the $x$- and $y$-axes in the above figure correspond to global $G_\mathrm$, the azimuth and declination angles are defined as follows: Directions and headings are defined in the horizontal plane in OrcaFlex as the azimuth angle of the direction, in degrees, measured positive from the $x$-axis towards the $y$-axis, as shown in the following figure.ĭirections for waves, current and wind are specified by giving the direction in which the wave (or current or wind) is progressing, relative to global axes.
