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The airplane is flying a 40° magnetic heading, while the station is 310° relative to the plane (called "relative bearing"). The magnetic bearing to the station in this case is 350°. The ADF indicators are a kind of navigational display consisting of a dial and a needle that rotates around the dial and points to the beacon.
However, using a separate RBI and compass, this requires considerable mental calculation to determine the appropriate relative bearing. [5] To simplify this task, a compass card driven by the aircraft's magnetic compass is added to the RBI to form a radio magnetic indicator (RMI). The ADF needle is then referenced immediately to the aircraft's ...
In nautical navigation the relative bearing of an object is the clockwise angle from the heading of the vessel to a straight line drawn from the observation station on the vessel to the object. The relative bearing is measured with a pelorus or other optical and electronic aids to navigation such as a periscope, sonar system, and radar systems ...
The course line is selected by turning an "omni bearing selector" or "OBS" knob usually located in the lower left of the indicator. It then shows the number of degrees deviation between the aircraft's current position and the "radial" line emanating from the signal source at the given bearing. This can be used to find and follow the desired radial.
In marine navigation, a pelorus is a reference tool for maintaining bearing of a vessel at sea. It is a "simplified compass" without a directive element, suitably mounted and provided with vanes to permit observation of relative bearings. [1] The instrument was named for one Pelorus, said to have been the pilot for Hannibal, circa 203 BC.
Target angle is the relative bearing of the observing station from the vehicle being observed. It may be used to compute point-of-aim for a fire-control problem when vehicle range and speed can be estimated from other information.
A lubber line, also known as a lubber's line, [1] [2] is a fixed line on a compass binnacle or radar plan position indicator display pointing towards the front of the ship or aircraft [3] and corresponding to the craft's centerline (being the customary direction of movement).
A Bellini–Tosi direction finder (B–T or BTDF) is a type of radio direction finder (RDF), which determines the direction to, or bearing of, a radio transmitter. Earlier RDF systems used very large rotating loop antennas , which the B–T system replaced with two fixed antennae and a small rotating loop, known as a radiogoniometer .