“That's the beauty of argument, if you argue correctly, you're never wrong.”Jim, do you know the nautical adage; «When the pilot points to the leading lights … the cadet looks at the finger»?
My example was regarding a simple way I would adopt to make a cadet understanding the difference between the distance run through the water from the distance run over the ground of a vessel proceeding in a non-static liquid. You can change the current from a ¼ of a knot to Gulf Stream 6 knots, the final outcome will all proportions guarded be the same. But I understand that you could’ve forgotten the basics since your maritime academic degree, if you ever held any, was conferred since ages. Serving ashore as an insurance clerk would certainly not help either.
Jim, when you sailed back and forth through the Pentland Firth, the Messina Strait's, the Strait of Corryvreckan or the Niagara Falls, did you compare the patent log with your DGPS WAAS? Have you kept any «evidences»? How can you understand those distance run differences if you’re not even able to make the distinction between an Ocean Current from a Tidal Current?
Being almost always on the defensive, even about what might seem like the most insignificant things, bring some people to enjoy arguing just for the sake of arguing.