Position lines
Your target lies somewhere along the position line.
It can be straight, or curved.
Linear features
road or bridge or mountain ridge that has a the path you need.
Transit
A line drawn between two identifiable points. In navigation and position fixing, a transit occurs when a navigator observes two fixed reference points that are in line with the navigator. This creates a position line. The intersection of two position lines tells the navigator his location. Sensitive reference points for transits are far apart; the closer they are, the more difficult it is to tell if they are lined up. Transits usually rely on visual reference points. Often that is their downfall; good visual conditions are needed to make use of them.
It is a positional line.
Resection is a method for determining a position (position finding) using a compass and topographic map (or nautical chart). When resecting or fixing a position, the geometric strength (angular disparity) of the mapped points affects precision and accuracy of the outcome. Accuracy increases as the angle between the two position lines approaches 90 degrees. Magnetic bearings are observed on the ground from the point under location to two or more features shown on a map of the area. Lines of reverse bearings, or lines of position, are then drawn on the map from the known features; two and more lines provide the resection point (the navigator's location). When three or more lines of position are utilized, the method is often popularly (though erroneously) referred to as triangulation (in precise terms, using three or more lines of position is still correctly called resection, as angular law of tangents (cot) calculations are not performed). When using a map and compass to perform resection, it is important to allow for the difference between the magnetic bearings observed and grid north (or true north) bearings (magnetic declination) of the map or chart.
london hotels kensington blog
