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VLF
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Diagram illustrating the commercially used bands of the radio-frequency spectrum, with labeled sections for VLF, LF, MF, HF, VHF, UHF, SHF, and EHF. Each band shows example uses such as maritime radio, AM/FM radio, television, mobile phones, satellite communications, and radio astronomy, along with a scale for wavelength and frequency.
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VLF

frequency band
Also known as: very low frequency
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Diagram illustrating the commercially used bands of the radio-frequency spectrum, with labeled sections for VLF, LF, MF, HF, VHF, UHF, SHF, and EHF. Each band shows example uses such as maritime radio, AM/FM radio, television, mobile phones, satellite communications, and radio astronomy, along with a scale for wavelength and frequency.
radio-frequency spectrum Commercially exploited bands of the radio-frequency spectrum.

VLF stands for very low frequency. This is a radio frequency band that ranges from 3 kilohertz to 3 megahertz.12

VLF radio waves have long wavelengths, with a VLF wave at 3 kilohertz measuring 100 kilometers (about 60 miles). Due to their long wavelengths, VLF transmissions require large antennas, and transmitters must use high power to compensate for lower efficiency.2

The VLF band is used for low-bandwidth analog services, including long-distance radio navigation and maritime communication channels. Because salt water is highly conductive, VLF transmissions can travel thousands of kilometers via surface waves, making them useful for maritime radio.2

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2 Britannica Sources
  1. VLF
  2. telecommunications media - VLF-MF

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