Sextants are obligatory on board of all worldwide operating vessels.
The reason: Independent position finding without any additional technical aid and independent of electrical power.
Sextant Mirrors – the circular horizon mirror may be a traditional split view mirror or a full view mirror.
To avoid prismatic distortions all sextant mirrors have to be absolute plan parallel. The glass has to be of the same thickness all over the whole area and the surface has to be exactly plane. The coating is highly scratch-proof and non corrosive. The diameter of the horizon mirror grants a large field of view of 8° extension.
