While changing course a right of way boat cannot interfere with another boat.

Comments

RULE 

Part 2 - When Boats Meet

Section B - General Limitations

Rule 16.2.  - In addition, when after the starting signal a port-tack boat is keeping clear by by sailing to pass astern of a starboard-tack boat, the starboard-tack boat shall not change course if as result the port-tack would immediately need to change course to continue keeping clear.