This program calculates your position by means of observations of stars or planets (a nautical almanac is not required). The user enters only his estimated position and the sextant altitudes of stars, planets, sun or moon. The program computes and plots the most probable position and an ellipse of probability around it, together with the lines of position (LOPs). Also includes applications for: star fix wizard, azimuth, rhumb line, great circle and ETA. Compatible with Windows 10.