§ 80.861   Required capacity.

   If  the main power supply or the reserve power supply provided for the
   purpose of complying with § § 80.859 and 80.860 consists of batteries, the
   batteries must have sufficient reserve capacity available at all times while
   the vessel is leaving or attempting to leave a harbor or port for a voyage
   in the open sea, and while being navigated in the open sea outside of a
   harbor or port, to permit operation of the radiotelephone transmitter and
   the  required receivers for at least 6 hours continuously under normal
   working conditions.

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