https://ecolregs.com/index.php?Itemid=505&id=23:vessel-a-has-vessel-b-on-her-own-starboard-side-relative-bearing-stbd-030&lang=en&option=com_k2&view=item
COLREGs course - Vessel A has vessel B on her own starboard side (relative bearing STBD 030°)
In accordance with Rule 15 (Crossing situation), when two power-driven vessels are crossing so as to involve risk of collision, the vessel (vessel A) which has...
on her ownstarboard siderelative bearingcolregscourse