C.F.R. » Title 47 » CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION › SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES › PART 80—STATIONS IN THE MARITIME SERVICES › Subpart T—Radiotelephone Installation Required for Vessels on the Great Lakes

47 C.F.R. § 80.963

Main power supply

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(a) A main power supply must be available at all times while the vessel is subject to the requirements of this subpart.

(b) Means must be provided for charging any batteries used as a source of energy. A device which during charging of the batteries gives a continuous indication of charging current must be provided.