Heading & Route Directions in aviation

Heading & Route Directions in aviation

  Heading & Route Directions in aviation:

Route:

  • Angle measured clockwise, formed by any reference and the direction of the projection on the ground of the desired aircraft movement.

References used (Geographic North & Magnetic North):

The direction of Geographic North (Ng) is a fixed position  and appears on every charts.(true north , TC=true course).
Magnetic North direction (Nm),  is the main reference to be used on board the aircraft when navigating, because the compass mechanism is based in the magnetism of the earth . (magnetic route, Mc = magnetic course).

Note: as you can see magnetic north differs from geographic north, and furthermore magnetic north varies very little each year, and magnetic north and magnetic south are not antipodal points.

 

 

 

Variation: It is the angle formed between the geographic north and the magnetic north, which can be  WEST or EAST.
If the Variation is EAST, by sign agreement it will be positive (+).
If the Variation is West(W), it is negative(-) by sign agreement.

 

 

 

 

 

 

Heading: Is the angle, measured clockwise, formed between any reference and the direction of the longitudinal axis of the aeroplane (affected by drift correction …).

References used:
– Direction of geographic north and Direction of magnetic north.

The angle between the true north and the heading it is True Heading ( TH).

The angle between the magnetic north and the heading it is  Magnetic Heading ( MH).

 

One of the instruments that we use to know the direction of our plane is the compass. And the compass it is based in the magnetism of the earth. However the compass has some manufacturer errors, or even the magnetism made by another instrument leads in an error.
Those errors makes that every compass has its own compass north.
The angle between the compass north and the magnetic north it is called variation

The variation can be East ( positive sign in the formula just below ) or West ( negative sign in the formula).

 

 

 

Leave a Comment

Your email address will not be published. Required fields are marked *

Name*

Email

Website


This site uses Akismet to reduce spam. Learn how your comment data is processed.