My son is a sophomore in High School and they just had a rep come talk to them from a company called Marine Tech. Institute. I believe it is somehow affiliated with the NASCAR Institute in North Carolina.
Anyway, they gave out a real nice brochure on the school and courses, and I know a Mercury Certification was one of the courses. They have a website also--when I get home I will get it and post it here for you.
My son seemed real interested in it and it is close by in Orlando, Florida--but I think they have other campuses!
Hope this helps!