Thanks for the post, both my father and father in law served in the USCG, both served right at the very tail end of WWII. My dad in the P.I. as a radio operator, my father in law learned navigation and served aboard a light ship up in the arctic. He took his navigation skills into the maritime service and worked his way up the ladder to full Captain with American President Lines. They both are gone now but would have truly appreciated your post.
My FIL was a character to say the least, navigation was his lifelong passion. On many of his voyages he would get a couple of midshipman that had just graduated from the Maritime Institute in Maryland. He would wait until the ship had left landfall and would then ask "Mr or Ms. what is our current position?" The young officer would walk over to the nav/sat and respond with the current reading. Old Jack would then walk over and shut the machine off and say "Massive power failure, what is our current position?" They would not have any idea how to figure out where they were. He would walk over to his locker and pull out his well worn sextant and begin Navigation 101. Many of his midshipman would later tell him that it was the most interesting thing they ever learned. He was a very good sailorman.