Yes I was taught the same way. Our first spring line
is then our midship static ( it can go forward or rearward as it is on a puiling in the middle of the boat) spring line
I agree we have this line
and the other two springs colored differently, bow aft and stern forward are red. Midship static is Yellow. Bow and stern blue.
I laughed when you told how you tell you guests that you need to see so sit down. I used to do that and one of them lept forward out of the cockpit and stumbled up to the bow to get out of my line of sight as I just shook my head is disbeleif.