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61. | course; heading |
| 航向 |
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62. | course correction |
| 方向修正量 |
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63. | course duration |
| 修业期 |
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64. | meandering course |
| 曲流 |
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65. | course plotting |
| 画航线 |
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66. | course selector |
| 航道选择器 |
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67. | course recommended |
| 推荐航向 |
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68. | penetration course |
| 灌层 |
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69. | course resolver |
| 航向解算器 |
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70. | supporting course |
| 承重层 |
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