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41. | be on her course |
| 航向不变 |
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42. | course matching |
| 航向匹配 |
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43. | course over ground |
| 对地航向 |
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44. | parallel course |
| 平行航向 |
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45. | pilot indicating lamp |
| 航向指示灯 |
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46. | average heading |
| 平均航向 |
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47. | course recommended |
| 推荐航向 |
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48. | final great-circle course |
| 终航向 |
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49. | course recording paper |
| 航向记录纸 |
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50. | analogcourse computer |
| 航向模拟计算机 |
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