When two power-driven vesselsThe term 'power-driven vessel' means any vessel propelled by machinery. More are crossing so as to involve risk of collisionThe term risk of collision is described in Rule 7. 'Every vessel shall use all available means appropriate to the prevailing circumstances and conditions to determine if risk of collision exists. If there is any doubt such risk shall be deemed to exist.' More, the vesselThe word 'vessel includes every description of water craft, including non-displacement craft, WIG craft and seaplanes, used or capable of being used as a means of transportation on water'. which has the other on her own starboard side shall keep out of the wayRule 16 Action by give way vessel - Every which is directed to keep out of the way of another vessel shall, so far as possible, take early and substantial action to keep well clear. More and shall, if the circumstances of the case admit, avoid crossing ahead of the other vessel.