https://en.wikipedia.org/wiki/Melbou...vans_collision
Remember this?
Junior officers at the helm, loss of situational awareness. Turned, then turned again until they put their vessel squarely into the path of an aircraft carrier, said aircraft carrier cut them in half.
Or this:
https://en.wikipedia.org/wiki/SS_Andrea_Doria
A "radar assisted collision" of navigational solution #2, below.
I suspect the problem may have been a combination of the two, and reminds
us all -- whether on land, at sea, or in the air:
IF THE BEARING BETWEEN YOU AND ANOTHER VESSEL REMAINS CONSTANT
OVER TIME, THERE CAN BE ONLY ONE OF TWO NAVIGATIONAL SOLUTIONS:
1 - You are on a parallel course.
2 - You are on a collision course.
The distinction requires the navigator to note the change of range that exists in the situation of a collision course.