Good to know Matt! I did some looking into the Carolina tartan as well and saw the other N.C. and S.C. tartans--that kind of threw me for a loop. As for this tartan from the OP, I just figured it was a personal design that recognized "those in peril at sea" in the mind of the designer.

I share your thoughts about the Edzell and Leatherneck tartans as widely used and accepted (even without official service recognition). Sometimes, especially in the military, traditions develop over years and not from some "officially recognized" source. With that in mind, the Edzell and Leatherneck tartans are "traditional" to our Navy and Marines, as they have been widely accepted, worn and has developed over many years.

Thanks for the warning or insight (insight sounds "nicer").