check out
www.nemaritime.com
i took their course to upgrade from 6pack to masters - 50 ton and i think they sell the
books as well as a home study course and a cd for pc that really helps with rules of the road which requires a score of 90 to pass. if you are planning to test, and not just
buying the books for reference, i suggest you see who is teaching in your area. i learned more from the class than just answers to cg exam questions. capt. lar