Position Circle (distance by vertical sextant alt, horizontal angle or radar) :
Position circle means a circle of positions. It is a curve or a set of all probable positions of ship, equidistant from a point. Out at sea, it is very common to use principle of position circle to find ships position, in day to day navigation.
Plotting of ships position using two or three radar distances, where position is obtained at the, intersection of two or three such position circles. Also plotting a position using a bearing & a distance off, position & position is intersection of the position circle & position line.
Following are some of the common methods of obtaining position circles. :