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But radio compass bearings were relatively new navigational aids at the time and not trusted by veteran mariners.

Of these the 750 wave is reserved for government stations such as radio compass stations, etc.;

The radio compass is dependable day or night, and is said to be quite as reliable as a sextant or other navigating instruments.

Quickly he manipulated the coil of his radio compass.

"Now I'm going to test that radio compass and see what may be expected of it in the morning if we don't find Mr. Crusoe to-night, which isn't very likely."