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The methods of determining a ship’s position in terrestrialnavigation by using vertical and horizontal angles are nowadaysrarely used. The reason is the relative complexity of the procedureand the lack of accuracy of some methods. Different methods ofusing horizontal and vertical angles to obtain the line of position(LOP) will be presented in this paper, as well as the occurringerrors and recommendations for use. In this paper, the sextantwill be considered a basic instrument for measuring horizontaland vertical angles. The sextant allows a very precise measuringof angles from which very accurate lines of position can beobtained

The Use of Horizontal and Vertical Angles in Terrestrial Navigation