Sanguine (transmitter)
Encyclopedia
Sanguine was the name of an SLF
Super low frequency
Super-low frequency is the frequency range between 30 hertz and 300 hertz. This frequency range includes the frequencies of AC power grids ....

-transmitter of the US-Navy, which was used to transmit on the frequency 76 hertz
Hertz
The hertz is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of the sine wave, particularly those used in radio and audio applications....

 signals to submarines. The transmitter sites were in Michigan and Wisconsin. As aerial ground dipoles were used.

The analogous Russian system is called ZEVS
ZEVS
Zevs or ZEVS may refer to:* ZEVS, A Soviet/Russian submarine communication system, see Communication with submarines.* Zevs, A French street artist, see Zevs...

and located near Murmansk.
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