Section 9(d) in Prevention Of Collision On National Waterways Regulations, 2002
(d)In a narrow channel when overtaking can take place only if the vessel to be overtaken has to taken action to permit safe passing, the vessel intending to overtake shall indicate her intention by sounding the appropriate signals prescribed in Regulation 34(b). The vessel to be overtaken shall if in agreement, sound appropriate signals prescribed in Regulation 34(b) and take action to permit safe passing. If in doubt she may sound the signal prescribed in Regulation 34(c). This regulation does not relieve the overtaking vessel of her obligation under Regulation 13;
