AVIA101 Lecture Notes - Lecture 10: Magnetic Declination, Visual Flight Rules, Canadian Airspace
Document Summary
Vfr charts are oriented in degrees true: variation must be taken into account when navigating. Ex 310 true and 8 degree variation = 318. Aircraft rotates around the compass (compass is mostly stationary north seeking) Isogonals (found on most vfr maps: lines joining areas of equal magnetic variation. Agonic line joins places of zero magnetic variation. Compass interpretation: graduated in 5 degree divisions, last zero omitted, numbers appear to be going the wrong way when the aircraft turns. Limitations: pitch 20 degree (compass does not work properly) Anything magnetic or electronic within the aircraft will cause error. To correct, compass needs to be swung once a year. Errors that still remain b/w the magnetic heading and the compass heading is called deviation. Compass correction card allows pilot to correct for deviation: magnetic dip. Magnetic field lines dipping into the earth at the north/south poles causes errors (problem in higher latitudes close to the poles)
