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  This preamble also allows suppression of certain types of MSI that are not relevant to a particular ship. Rate my site. On drawing the pattern it comes like the spokes of a wheel. Interference from or receipt of stations farther away occasionally occurs at night. Radio waves have frequencies from GHz to as low as 3 kHz, and corresponding wavelengths from 1 millimeter to kilometers. GMDSS Power Supply If the main source of electrical power suddenly fail the accumulator provides power for at least one hour for your radio systems, and emergency source will take over when it is ready.