Spider cracks! They typically only go the depth of the gelcoat and are from impact or flexing. I would say impact based on you location. The typical fix is to grind out the crack with a tapper cut then refill with new gelcoat. You’ll need to experiment to color match the hull.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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