Loran-A used two frequency bands, at 1850 kHz and 1.950 kHz, smack in the middle of a frequency band exclusively allocated to radio amateurs.
The cathode ray tube had the advantage that the pulses were still recognizable on the screen even when the amplitude of the interference surpassed that of the pulse. It was the only steady signal amongst all kind of interference jumping around. It was even possible to use Loran under circumstances that would have shut down medium and short wave communication. Quite remarkable.
I only sailed once with a RCA Loran A which was attached to the bulkhead in the chart room. It was never used but as the youngest officer I was intrigued by it and started to read the manual. It was not to difficult too learn how to get a fix with the help of the special Loran charts, but only in the western part of the Atlantic. The captain shrugged and said his faith was in a good old fashioned star fix.
Only on one occasion, after five days in very bad weather and failing to see sun or stars, I was asked to get a fix. They did even wake me up for that, it was suddenly urgent. It appeared that we were blown a good distance in the direction of Greenland… That felt good! But after that it was back to normal again.