# The Merchant Shipping (Radio Installations) Regulations 1992, Paragraph 2


Weekly
(a) The proper operation of the DSC facilities shall be tested at least once a week by means of a test call, when within communication range of a coast station fitted with DSC equipment. Where a ship has been out of communication range of a coast station fitted with DSC equipment for a period of longer than one week, a test call shall be made on the first opportunity that the ship is within communication range of such a coast station.
(b) Where the reserve source of energy is not a battery (for example, a motor generator), the reserve source of energy shall be tested weekly.

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Source: https://www.legislation.gov.uk/uksi/1992/3/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/merchant-shipping-radio-installations-regulations-1992/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.