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assumed position The position (a-Lat, a-Lon) chosen by the navigator during the sight reduction process to facilitate the use of sight reduction tables. This is a purely fictitious position (no boat or celestial body is located there) which must be chosen as a reference point for the calculations since sight reduction tables give solutions for only whole degrees of Lat and LHA. Each sextant sight will have a unique assumed position and the LOP of that sight must be plotted from that position. It is recorded in Box 6 of the Workform. Sight reductions by programmed calculators do not require or use an assumed position. Abbreviation:  AP

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