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Figure 16-22. Finding true heading by the wind correction angle. N TC 090° GS 88 E WCA =14° L 0 1 071 061 P 02 01 TH 076° AS 120 1 4 0 2 ° 051 051 041 031 021 011 001 09 08 07 06 05 04 03 041 031 W 021 011 001 09 08 07 S Figure 16-23. Finding true heading by direct measurement. 16-16 90 N TC 090° GS 88 E P 10 20 30 40 50 60 TH 076° AS 120 70 80 001 011 W 021 071 061 051 041 031 S 90 10 20 30 40 50 60 76° 7 0 8 0 1 0 0 1 1 0 021 031 Briefly summarized, the steps in obtaining flight information • Variation—obtained from the isogonic line on the are as follows: chart (added to TH if west; subtracted if east) • TC—direction of the line connecting two desired • MH—an intermediate step in the conversion (obtained points, drawn on the chart and measured clockwise by applying variation to TH) in degrees from TN on the mid-meridian • Deviation—obtained from the deviation card on the • WCA—determined from the wind triangle. (Added aircraft (added to or subtracted from MH, as indicated) to TC if the wind is from the right; subtracted if wind • Compass heading—reading on the compass (found by is from the left) applying deviation to MH) that is followed to remain • TH—direction measured in degrees clockwise from on the desired course TN, in which the nose of the plane should point to remain on the desired course