Ok, then I’ll just post this again.
With regards to the failure of the watch to see the tanker:
The answer lies in inattentional blindness1, a condition that all people unknowingly exhibit every waking moment of their lives. As the name implies, it is the failure to see an object located on or near the sightline because it does not engage attention. Although the phenomenon has long been known, recent evidence shows that it is much more pervasive that anyone had imagined and that it is one of the major causes of accidents and human error.
We call it cloaking (as in Klingon cloaking device) when we are looking for something and know we are looking at it but not seeing it.