That's tiny..
It's an easy repair if you ever done any type of body work...
This thread give a lot on info, you can also search around, search the web for fiberglass repair, there's tons of how to's and videoes.
http://www.pwctoday.com/f15/carnage-resurection-146248-5.html
I'd take a grinding wheel to it and cut out all the damage, and flare out the hole and gel coat a good inch or 2 around the hole. When grind the surrounding gel coat you'll get a better idea how far you need to go, and you need to dry out the interior wood and fiberglass, I used a hair dryer on it continously for few days.
Then head to west marine and get some expoxy and filler(this is like a powder mix additive). Mix the expoxy, use some of it to coat the area completly, then add the filler to the remaining expoxy mix you have and make it pudding consitency or peanut butter, then push it into the hole, you want to get enough expoxy in the hole to make a plug and fill the space between the innner and outter hull to give it some strength. Depending on the hole & expoxy you may have to do several layers, sanding in between to roughen the sufface and build it up higher than the existing gel coat, you can then shape the area with a grind wheel, and repeat till you get it as good as you want, no one is going to see it. Once you're satified you then either paint it white or get some gelcoat white(with wax) and paint it on there(several coats), then sand it smooth....
