ES-CY-L4.2

Ocean passage planning and great-circle sailing

ES-CY-M4 · Compass error and ocean passage planning · ES-CY-M4-A Compass error from Polaris and the Sun's amplitude; routeing charts and great-circle sailing (UT1, UT2).

Routeing charts and publications for the **organización de la derrota**, then the **rumbo inicial** and **distancia ortodrómica** by formula.

Independent study. xplor is not affiliated with the Dirección General de la Marina Mercante, any Spanish regional government or the Govern de les Illes Balears, and awards no title, certificate or endorsement. Passing these mocks does not replace the official theory exam, and the title also requires the regulated practicals at an authorised nautical school, the radio course and a medical report. AI-drafted content pending subject-matter-expert review.