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Figure 14.4. Great Circle True Direction Is Constant ........................................................................ 299
Figure 14.5. Correction for Moon's Parallax ...................................................................................... 299
Figure 14.6. Grid Overlay Superimposed on Lambert Conformal (Convergence Factor 0.785)....... 300
14.8. Relationship of Grid Direction to True Direction .......................................................... 300
14.9. Polar Angle..................................................................................................................... 300
AFPAM11-216 1 MARCH 2001 15
14.10. Chart Transition.............................................................................................................. 300
14.11. Crossing 180th Meridian on Subpolar Chart.................................................................. 301
Figure 14.7. Crossing 180th Meridian on Subpolar Chart.................................................................. 302
14.12. Grivation........................................................................................................................ 302
Figure 14.8. Grivation........................................................................................................................ 302
Section 14D Gyro Precession
14.13. Basics ............................................................................................................................. 303
14.14. Real Precession .............................................................................................................. 303
Figure 14.9. Real Precession .............................................................................................................. 304
14.15. Apparent Precession....................................................................................................... 304
Figure 14.10. Initial Location of Gyro Affects Earth Rate Precession................................................. 305
Figure 14.11. Direction of Spin Axis Affects Earth Rate Precession................................................... 306
Figure 14.12. Earth Precession Varies According to Latitude ............................................................. 306
14.16. Earth Transport Precession (Horizontal Plane).............................................................. 307
Figure 14.13. Earth Transport Precession............................................................................................. 307
14.17. Grid Transport Precession.............................................................................................. 307
14.18. Summary of Precession.................................................................................................. 307
14.19. Gyro Steering ................................................................................................................. 308
Section 14E Starting a Grid Navigation Leg
14.20. Basics ............................................................................................................................. 308
14.21. Using a Zn Graph ........................................................................................................... 308
Figure 14.14. Grid Precomp ................................................................................................................. 309
Figure 14.15. Zn Graph ........................................................................................................................ 310
14.22. Applying Precession to the DR ...................................................................................... 310
Figure 14.16. Typical Mission In-Flight Log ....................................................................................... 311
14.23. KC-135 Method.............................................................................................................. 311
14.24. False Latitude ................................................................................................................. 311
Figure 14.17. False Latitude Correction Table..................................................................................... 312
14.25. Summary ........................................................................................................................ 312
Chapter 15—PRESSURE PATTERN NAVIGATION
Section 15A Pressure Differential Techniques
15.1. Basics ............................................................................................................................. 313
15.2. Constant Pressure Surface.............................................................................................. 313
15.3. Geostrophic Wind .......................................................................................................... 313
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