Navigation. Done by: Salama alketbi Meera alshamsi. Dead reckoning. Dead reckoning Further information: Dead reckoning The navigator plots his 9am position, indicated by the triangle, and, using his course and speed, estimates his position at 9:30am and 10am.
5- Computation of the interval to noon, watch time of local apparent noon, and constants for meridian or ex-meridian sights.