ground reference
| navigation
| ground-reference | |
| el. | 参考地面 |
| navigation | |
| comp., net. | 漫游 |
| environ. | 导航 |
| exhib. | 引导 |
| hydroel.st. | 航行; 航运 |
| interntl.trade. | 航船 |
| interntl.trade. од. | 领航 |
| navig. | 航海; 导航 |
| skydive. | 航空 |
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| 参考地面 | |||
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ground reference : 12 phrases in 7 subjects |
| Automobiles | 2 |
| Aviation | 5 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Geophysics | 1 |
| Nautical | 1 |
| Technology | 1 |