International Regulations For the Prevention Of Collisions at Sea
Provides free assistance in learning the International Regulations for the Prevention of Collisions at Sea (Col Regs/IRPCS) and includes links to relevant sites.
www.sailtrain.co.uk Details

NavRules
Free formal training program to learn the 'rules of the road', required of all boat operators. Internationally recognized Collision Regulations and US Inland Rules.
www.navrules.com Details

Navigate
A free online course designed to provide all small boat professionals with the basics of navigation in basic coastal navigation.
home.att.net Details

Navigation, Boat Handling, Sailing (RYA Yachtmaster course)
Free online slide-show tutorials written by a Yachtmaster instructor. Comprehensive, module-based, and includes titles such as Safety, Weather, and Passage Planning.
www.murorum.demon.co.uk Details