The Flight Navigator Handbook by Federal Aviation Administration

Author:Federal Aviation Administration
Language: eng
Format: epub
Publisher: Skyhorse
Published: 2013-01-01T00:00:00+00:00

Figure 7-19. Weather avoidance.

Figure 7-20. Penetration of thunderstorm area.

Heading Marker Correction

For optimum accuracy, it may sometimes become necessary to correct the bearings taken on the various targets. This necessity arises when the heading marker reading does not agree with the TH of the aircraft when azimuth stabilization is used, or the heading marker reading does not agree with 360° when azimuth stabilization is not used.

For example, if the TH is 125° and the heading marker reads 120°, all of the returns on the scope indicate a bearing that is 5° less than it should be. Therefore, if a target indicates a bearing of 50°, add 5° to the bearing before plotting it. Conversely, if the heading marker reads 45° when the TH is 040°, all of the scope returns indicate a bearing that is 5° more than it should be. Therefore, if a target indicates a bearing of 275°, subtract 5° from the bearing before plotting it. The greater the distance to the target from the aircraft, the more important this heading marker correction becomes.

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