What is a deviation card?
A deviation card is produced after your onboard compass, usually located at the wheel binnacle, has been swung. Ideally this is done annually. The compass deviation card marks deviation, as the name suggests, for different headings. Readings are usually taken at 30 degree intervals from 000 and 360 degrees.
How long is a deviation card valid?
two years
The Administration requires that the Deviation cards are be reviewed every two years.
What causes the ship’s deviation?
Deviation is caused by iron, magnets and magnetic fields (from electronic equipment), all of which influence the Earth’s magnetic field around the boat. This means that you should avoid placing any of the above items near where you will be using a compass.
What is deviation card in ship?
noun. a card, sheet, or the like, with two compass roses printed on it concentrically, for recording, on a given voyage, the amount of deviation for which the navigator must compensate in using the ship’s compass to steer a magnetic course.
What is deviation in ship?
Deviation is the amount by which the ship’s compass is affected by the characteristics of the vessel (such as the engine block and wiring / other ferrous metal objects, etc).
What is the used of deviation card table?
A table of the deviation of a magnetic compass on various headings, magnetic or compass; for an aircraft compass, this information is usually placed on a card called a deviation card. Also known as magnetic compass table.
What is deviation card on ship?
a card, sheet, or the like, with two compass roses printed on it concentrically, for recording, on a given voyage, the amount of deviation for which the navigator must compensate in using the ship’s compass to steer a magnetic course.
What is deviation in aviation?
Deviation – When mounted in an aircraft or a ship, a compass is not only influenced by the Earth’s magnetic field, but by the magnetism of the iron used in the construction of the vehicle as well. This causes a compass error referred to as “deviation”.
What is the use of deviation?
In mathematics and statistics, deviation is a measure of difference between the observed value of a variable and some other value, often that variable’s mean. The sign of the deviation reports the direction of that difference (the deviation is positive when the observed value exceeds the reference value).
What is deviation in maritime?
The maritime deviation is the additional distance away from the main shipping routes it takes to service a specific port.
What is variation and deviation?
Variation is a magnetic interference common to all vessels. Deviation is a magnetic interference unique to the vessel itself. We use the term ‘deviation’ use to describe the effect of interference from magnetic fields created by the vessel’s own equipment.
What is called deviation?
Definition of deviation : an act or instance of deviating: such as. a navigation : deflection of the needle of a compass caused by local magnetic influences (as in a ship) b mathematics : the difference between a value in a frequency distribution and a fixed number (such as the mean)