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| 31. | on-course selector |
| 航向选择器 |
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| 32. | equivalent single course |
| 直航向 |
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| 33. | great circle course |
| 大圆航向 |
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| 34. | hypothetical course |
| 推测航向 |
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| 35. | fore-and-aft overlap |
| 航向重叠 |
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| 36. | on-course curvature |
| 航向曲率 |
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| 37. | directional instability |
| 航向不稳定性 |
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| 38. | intended course |
| 计划航向 |
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| 39. | original heading |
| 起始航向 |
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| 40. | intermediate course |
| 中间航向 |
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