This course covers the subject of magnetism, with particular emphasis on the direct reading compass and the flux valve. The Earth's magnetic field is discussed, with an explanation of how it is indicated by flux lines and how a compass needle aligns with these lines. The difference between true north and magnetic north is explained as a variation that changes with latitude due to the horizontal and vertical components of the magnetic field. Magnetic materials are divided into hard iron and soft iron and their magnetic properties are explained. The course also covers how to calculate true and magnetic heading.