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.