Sec.  80.925   Electric light.

   (a) If the vessel is navigated at night an electric light or dial lights
   which clearly illuminate the operating controls must be installed to provide
   illumination of the operating controls at the principal operating position.

   (b) The electric light must be energized from the main power supply and, if
   a reserve power supply for the radiotelephone installation is required, from
   the reserve power supply.