Section 13(b) in Prevention Of Collision On National Waterways Regulations, 2002
(b)A vessel shall be deemed to be overtaking when coming up with another vessel from a direction more than 22.5 degrees abaft her beam. That is, in such a position with reference to the vessel she is overtaking, that at night she would be able to see only the sternlight/towing light of that vessel but neither of her sidelights; and
