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| navigation aid (v.gr., TACAN, radar, etc.) | |||
| navigation aid | |||
| navigational aid; navigational mark; navaid; aid to navigation | |||
| navigational assistance | |||
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| navigational aides probably should be navigational aids | |||
| aid to navigation; navigation aid; navigational aid; navigational assistance | |||
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ayuda a la navegacion : 24 phrases in 3 subjects |
| Communications | 5 |
| Technology | 5 |
| Transport | 14 |