Airspeed

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The inherent speed is the speed of a self or the speed of the vehicle in which it is located, relative to a reference object (, e.g., land, air, water). Since air and water can move in relation to the country, the reference medium must be specified when specifying the speed of ships and aircraft. Mostly, the vehicle's own speed means the speed in relation to the surrounding medium (water, air).

aviation

In aviation , the airspeed describes the uncorrected speed of an aircraft relative to the surrounding air mass ( indicated air speed , IAS ). This is indicated by a speed measuring instrument (Airspeed indicator) and determined by measuring the dynamic pressure and the static pressure. The speed determined in this way depends on the air density and thus on the altitude and temperature of the air and only corresponds to the speed in relation to air (True Airspeed = TAS) in a standard atmosphere . Because this speed “measured” and displayed by the speed measuring instrument (Indicated Airspeed = IAS) is a direct measure of the aerodynamic behavior of the aircraft, IAS is the primary speed in aviation. When in aviation airspeed is not further specified, is usually the IAS or the measurement errors corrected CAS (Calibrated Airspeed) meant. This speed (IAS or CAS) is generally not the same as the speed at which the aircraft moves relative to the air (TAS). Equality only applies to standard atmospheric conditions at sea level. See also the main article Airspeed

Nautical

In nautical science , it is less common to speak of own speed , because here not only the wind but also the current must be taken into account. Therefore, it is better to distinguish between “ travel through water ” (own propulsion + wind influence) and “ travel over ground ”. The difference corresponds to the ocean current , which is usually between 0.5 and 2 knots. You can estimate it from the inclination of tons, but when anchoring it can also be measured directly .