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| long range navigation (工作在低频段的一种无线电导航系统。它利用主副台来发射计时脉冲。从几个台接收到脉冲的时间差形成一条双曲位置线，它可以从 LORAN 图中辨识出来。通过两条双曲位置线可以得到一个定位点。LORAN A 工作在1 750〜1 950 kHz 频段， LORAN C 工作在 90〜110 kHz 频段) | |||
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| long range navigation | |||
| 罗兰”远程导航: 9 phrases in 4 subjects |
| Air defense | 2 |
| Aviation | 5 |
| General | 1 |
| Technology | 1 |
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