compass deviation meaning in Hindi

Compass Deviation is caused by local magnetic effects.
Students have to calculate wind speeds, drift angles, magnetic compass deviations, fuel loads and air speed to plot their courses and always know their location.
The adoption of iron hulls for ocean-going ships had to wait until after Admiralty experiments had solved the problem of an iron-hull's effect on compass deviation.
A similar process is used to calibrate the compass in light general aviation aircraft, with the compass deviation card often mounted permanently just above or below the magnetic compass on the instrument panel.