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WarningsMeteorological warnings are issued by the New Zealand MeteorologicalService, and navigational warnings are issued by MNZ (from RCCNZ)and the New Zealand Hydrographic Office.Warnings are broadcast on VHF by Maritime Radio and on SSB byTaupo Maritime Radio as soon as possible after they have been received.The warnings are repeated on SSB following the next silence period, andthen at scheduled times until they are cancelled or replaced.All warning information is available from Maritime Radio stations orTaupo Maritime Radio on request.Information contained in radio navigation warnings is primarily to assistmariners on their approach to ports. Harbour authorities provide localharbour warnings, but if they do not have a continuous VHF radio service,Maritime Radio stations will broadcast radio navigation warnings ontheir behalf.Some of the information contained in coastal navigational warnings covers:• changes to lights, buoys and beacons affecting major shipping areas• the establishment of major aids to navigation, or significant changesto existing ones• the presence of large, unwieldy tows in congested waters, or vesselsengaged in seismic surveys that require other vessels to keep well clear• areas where search and rescue, weapon firing, cable- and pipe-layingactivities, anti-pollution exercises or other potentially dangerousoperations are being carried out near shipping areas• significant malfunctioning of radio communications services.RADIO HANDBOOK49