I'm interested in a Laser 171000 ish near me. It had a mark/line on the deck just in board of the port gunwale. Do you know what causes this. I have never seen it before.
It looks like something rubbed up against it over time. My thoughts are possibly the tiller or it could have slid under the edge of a floating dock and rubbed up against the facia-- although that amount of abrasion would require that to have happened more than once. Any chance you can get more pictures? It does look to be mostly cosmetic in nature.
Boat comes from a keen racer, it has a carbon top section and lots of sails, so I think it maybe cracking in the deck gel coat. The damage is over an area that would take a lot of weight/movement.