The Art of Navigation
hen two prominent features appear in a line, one behind the other as seen from your boat, it forms a line of position, or a range line. Before electronic position fixing, the use of ranges was the tried-and-true method of staying in the center of a channel and knowing when to make a course change. Even if your boat is equipped with a suite of modern electronics, a range line can come in handy. The use of ranges is especially valuable when you want to increase situational awareness without taking your eyes off the horizon. Monitoring a range line is one of the best ways to assess the set of the current or to distinguish safe from hazardous
