Grade 12 – Nautical Science

September 1, 2020


This website has been compiled for the guidance of and use by grade 12 learners taking Nautical Science as one of their secondary school subjects. It follows the approved national curriculum for the subject and comprises three parts, namely Navigation, Seamanship and Communications Metereology is covered on Grades 10 & […]
October 12, 2020

How to tackle your final Grade 12 exam papers – video tutorials

To assist Grade 12 students in preparing for the Paper 1 and Paper 2 final exams, we asked well-known maritime educator, Professor Dr Captain Ed Snyders, to provide a step-by-step guide using the IEB 2018 Nautical Science final exam papers.  Each of the two papers have been divided into short […]
October 14, 2020

Annexures associated with the exam videos

Annexure 1: Deviation card Annexure 2: Altitude correction tables 10°- 90° – sun, stars and planets Annexure 3: Conversion of arc to time Annexure 4: 1994 Nov. 30, Dec. 1, 2 (Wed., Thurs., Fri.) Annexure 5: Increments and corrections 30′, 31′ Annexure 6: Increments and corrections 32′, 33′ Annexure 7: […]
September 1, 2020

The spherical triangle

During the discussion of the celestial sphere last year, we discussed the spherical triangle PZX which was formed by the projected positions of the celestial pole (P), the observer’s zenith (Z) and the celestial body (X), on the celestial sphere. It was stated that the solution of this triangle formed […]
September 1, 2020

The Marcq St Hilaire method of sight reduction

In the Marcq St Hilaire method, a calculated zenith distance or altitude is compared with the observed zenith distance or altitude to obtain an intercept which is plotted from a DR position in the direction of the body’s true bearing. In explaining this method, the altitude and not the zenith […]