1 There are various conditions in which one part of the body overgrows others because of a genetic or congenital reason. An example of such a reason that would cause swollen legs is Klippel-Trenaunay syndrome.  Disuse edema â Not using a limb causes changes in blood flow and return to and from that limb.
A non-directional (radio) beacon (NDB) is a radio transmitter at a known location, used as an aviation or marine navigational aid. bearing is a line passing through the station that points in a specific direction, such as 270 degrees (due West). NDB bearings provide a charted, consistent method for defining paths aircraft can fly. In this fashion, NDBs can, like VORs, define  airways  in the sky.
ADF equipment determines the direction or bearing to the NDB station relative to the aircraft by using a combination of directional and non-directional antennae to sense the direction in which the combined signal is strongest. This bearing may be displayed on a relative bearing indicator (RBI).