I spent Friday washing and waxing the boat (Hydrasport 230 WA Lightening Series) and I noticed a small ding

(about the size of a quarter) in the port walkaround, about 2 feet towards the bow from the cockpit. It appears as though something heavy and blunt hit it (like the head of a hammer). It has a hairline fracture around the small circle and is slightly spongy to the touch. The decking is gel with a diamond pattern and there is no easy way to get to it from the bottom. Any suggestions as to how to make this right?
Thanks.