Own vessel was arriving at a major Asian port by night and was three miles away from the pilot station. We were making 9kt on course 030°. Suddenly, we observed a large outbound tanker crossing ahead at a small angle from our port to starboard, showing a fine green light. Soon the tanker called us on VHF and requested the routine port-to-port or 'red-to-red' passage. Due to the alignment of the narrow fairway, it was assumed that the outbound vessel would soon arrive at the course alteration waypoint, alter to starboard and steer the reciprocal of our course and shape to pass on our port side.
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