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VLF radio communications (also known as myriametre band) is a low frequency, and hence low bandwidth radio frequency able to penetrate to a depth of forty metres in salt water and commonly used for communication with submarines near the surface. VLF radio signals are also used for secure communications, time signals and navigation beacons. Very low frequency radio more

VLF radio communications (also known as myriametre band) is a low frequency, and hence low bandwidth radio frequency able to penetrate to a depth of forty metres in salt water and commonly used for communication with submarines near the surface. VLF radio signals are also used for secure communications, time signals and navigation beacons. Very low frequency radio waves (3 kHz to 30 kHz) are typically bounced off the ionosphere, which guides them around the surface of the Earth. They have an extremely long wavelength of 10 to 100 kilometres and are therefore able to diffract around mountain ranges and other obstacles.

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