Half of the point of being able to spot each other miles away, is to make this a nonissue. It seems obvious that if you ask a tanker to make a 90° turn, it's g

Half of the point of being able to spot each other miles away, is to make this a nonissue. It seems obvious that if you ask a tanker to make a 90° turn, it's going to take them a few miles. But it's easy to forget that if they corrected course 6 miles away, a 5° correction would have been plenty. This should be a solved problem. More accidents are caused by the failure to keep a proper watch, than anything else. (last number I saw was 40%.) We have the technology - it's been mandatory past 300tonnes for over 10 years. Unfortunately the navy regularly opt-out. Apparently even in busy lanes at night.