coastline refraction

Also found in: Dictionary.

land effect

land effectclick for a larger image
An error in direction finders resulting from the refraction of electromagnetic waves when traveling from land to water or crossing a coast. As far as possible, those beacons that do not involve changing the medium over which electromagnetic waves travel should be used. Also called coastline refraction and shoreline effect.

shoreline effect

The refraction of electromagnetic waves when crossing a land or a water interface (crossing a shoreline). The bending of the radio waves results in errors in the direction finders. The extent of bending depends on the angle with which the radio waves cross the shoreline. As the crossing angle becomes smaller, the refraction increases. Radio waves traveling parallel to the coastline tend to curve inland. Also called land effect and coastline refraction. See coastal refraction.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved