Electromagnetic waves

From International Dictionary of Marine Aids to Navigation
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The waves which occur in the natural process by which electric and magnetic effects are propagated. Electromagnetic waves are known as Hertzian waves, infra-red rays, light, ultra-violet rays, X-rays, etc., depending on their frequencies.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM