It's very interesting is what it is, I haven't got a clue LOL Maybe this "bump" will catch the eye of someone who does. I'm curious to know myself now.
Looks like a template layout of some kind. There are three circles inside the outer line with numbers written in two of them and what looks like BS in the colored one. Layout for something to mount, maybe.
In the future...... please just post your question in one area. I understand why/how this one got posted but, if you want an entire board response it is better up here in Boat Topics and not in a separate manufacturer area.
Okay now that the "possible inspection label" has been identified ................ GO CATCH SOME FISH!!!!!!