I used this book and CD to prepare for an inland master's exam. The CD is very helpful and allows you to rapidly practice the exam and receive a score. Two major warnings:1) The "master and mate inland rules of the road" practice exam on the CD doesn't really test the USCG "inland only" questions. You have to set it up to do a "custom" exam and select inland only.2) All the navigation problems on the CD were just course - speed - time problems not involving a real chart. On the real exam the problems were specific to an actual chart as in "Starting from a point two miles due East of Ferndorf Light plot a course......". You are therefore probably going to need some other source of training on the navigation problems besides this book and CD.