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Briefly summarized, the steps in obtaining flight information are as follows: 

• TC—direction of the line connecting two desired points, drawn on the chart and measured clockwise in degrees from TN on the mid-meridian 

• WCA—determined from the wind triangle. (Added to TC if the wind is from the right; subtracted if wind is from the left) 

• TH—direction measured in degrees clockwise from TN, in which the nose of the plane should point to remain on the desired course 

• Variation—obtained from the isogonic line on the chart (added to TH if west; subtracted if east) 

• MH—an intermediate step in the conversion (obtained by applying variation to TH) 

• Deviation—obtained from the deviation card on the aircraft (added to or subtracted from MH, as indicated) 

• Compass heading—reading on the compass (found by applying deviation to MH) that is followed to remain on the desired course 

