Fin placement, fin box systems vs. glass ons

I see a lot of measurements tossed around when discussing fin placement. Some people seem to measure tow from rail, some from stringer. And I’m really confused when it comes to where those measurements fall in place. Also how to translate them to incorporating fin boxes.

Is anyone able to shed some light on this and set me straight? After searching archives, this is still really unclear, Thx

808!

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