Jackspeak of the Royal Canadian Navy

Range Lights

A night-time navigational aid that consists of two lights in a line marking a channel. The correct course to steer to get through the channel is an extension of a line formed by the lights. Usually the front range light is the lower of the two, and nearer to the mariner using the range. The rear light is higher and further from the mariner. All a mariner has to do is keep the lines in line, with the rear light directly on top of the front light, and they can assume that they are safely in the middle of the channel.

Added: 2014-11-01 Last modified: 2014-11-01