Once the distance and direction are known, the latitude and departure can be calculated using right triangle trigonometry as discussed in the previous section on “Coordinates.” These values will indicate the distances north or south and east or west between the two points. The coordinates on the unknown point can then be determined by algebraically adding the latitude to the northing of the known point and the departure to the easting of the known point. A positive, or north, latitude is added to the northing while a negative, or south, latitude (or the absolute value of the latitude) is subtracted from the northing. A positive, or east, departure is added to the easting while a negative, or west, departure (or the absolute value of the departure) is subtracted from the easting.