RANGE LINE SURVEYS
A Range Line Survey is similar to Depth Survey except recorded data are Longitude and Latitude of points along tracks identified by Range Markers. A range is defined as: ‘Two or more objects in line. Two beacons are frequently located for the specific purpose of forming a range to indicate a safe route or the centerline of a channel.. .” Ranges on NOAA paper charts are typically shown as two fixed aids connected by a dashed line that extends out from the fixed aids. This dashed line, called a leading line, becomes a solid line on the portion of the range where vessels are to transit, for instance in a maintained channel.