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Figure 13.4. Periscopic Sextant .......................................................................................................... 281
13.5. Electrical Cables............................................................................................................. 283
13.6. Sextant Case ................................................................................................................... 283
Section 13B Errors of Sextant Observation
13.7. Basics ............................................................................................................................. 283
13.8. Parallax Error ................................................................................................................. 283
13.9. Atmospheric Refraction Error........................................................................................ 284
13.10. Acceleration Error .......................................................................................................... 284
Figure 13.5. Correction for Moon's Parallax ...................................................................................... 285
Figure 13.6. Error Caused by Atmospheric Refraction ...................................................................... 286
Figure 13.7. Corrections for Atmospheric Refraction ........................................................................ 286
13.11. Coriolis Force................................................................................................................. 287
Figure 13.8. Error Caused by Coriolis Force...................................................................................... 287
13.12. Rhumb Line Error .......................................................................................................... 288
Figure 13.9. Coriolis Correction......................................................................................................... 288
Figure 13.10. Coriolis and/or Rhumb Line Errors in the Northern Hemisphere.................................. 289
13.13. Groundspeed Acceleration Error.................................................................................... 289
Figure 13.11. Combined Coriolis and Rhumb Line Correction ........................................................... 290
Figure 13.12. Acceleration/Deceleration Errors ................................................................................... 291
Figure 13.13. Groundspeed Acceleration Error.................................................................................... 291
13.14. Wander Error.................................................................................................................. 292
Figure 13.14. Wander Correction Tables ............................................................................................. 292
Figure 13.15. Wander Correction Applied to Ho ................................................................................. 293
13.15. Instrument Error ............................................................................................................. 293
Figure 13.16. Determining Sextant Error Correction ........................................................................... 294
13.16. Summary ........................................................................................................................ 295
Chapter 14—GRID NAVIGATION
Section 14A Introduction
14.1. Basics ............................................................................................................................. 296
Section 14B Problems Encountered in Polar Navigation
14.2. Basics ............................................................................................................................. 296
14.3. Unreliability of Magnetic Compass ............................................................................... 296
14.4. Problem of Converging Meridians................................................................................. 296
Figure 14.1. Converging Meridians.................................................................................................... 297
14.5. Grid Chart Projections.................................................................................................... 297
Section 14C USAF Grid Overlay
14.6. Basics ............................................................................................................................. 297
14.7. Relationship of Grid North (GN) to True North (TN) ................................................... 297
Figure 14.2. USAF Grid Overlay ....................................................................................................... 298
Figure 14.3. Great Circle True Direction Changes............................................................................. 298
　
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