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  2. Direction determination - Wikipedia

    en.wikipedia.org/wiki/Direction_determination

    Direction determination refers to the ways in which a cardinal direction or compass point can be determined in navigation and wayfinding.The most direct method is using a compass (magnetic compass or gyrocompass), but indirect methods exist, based on the Sun path (unaided or by using a watch or sundial), the stars, and satellite navigation.

  3. Automatic direction finder - Wikipedia

    en.wikipedia.org/wiki/Radio-magnetic_indicator

    While the ADF shows relative angle of the transmitter with respect to the aircraft, an RMI display incorporates a compass card, actuated by the aircraft's compass system, and permits the operator to read the magnetic bearing to or from the transmitting station, without resorting to arithmetic. Most RMI's incorporate two direction needles.

  4. Direction finding - Wikipedia

    en.wikipedia.org/wiki/Direction_finding

    A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately ...

  5. Heading (navigation) - Wikipedia

    en.wikipedia.org/wiki/Heading_(navigation)

    Magnetic; Deviation; Compass; The formula is always added moving down, and subtracted when moving up. The most complicated part is determining if the values are positive or negative. The True, Magnetic, and Compass values are directions on the compass, they must always be a positive number between 0–360.

  6. Magnetic declination - Wikipedia

    en.wikipedia.org/wiki/Magnetic_declination

    In the image at the right, the bezel's N has been aligned with the direction indicated by the magnetic end of the compass needle, adjusted for local declination (10 degrees west of magnetic north). The direction-of-travel arrow on the baseplate thus reflects a true north heading.

  7. Dead reckoning - Wikipedia

    en.wikipedia.org/wiki/Dead_reckoning

    The chariot pre-dated the navigational use of the magnetic compass, and could not detect the direction that was south. Instead it used a kind of directional dead reckoning: at the start of a journey, the pointer was aimed southward by hand, using local knowledge or astronomical observations e.g. of the Pole Star.

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