The SoftCharts Great Loop 2-Vol CD does not contain the Canadian waters -- only the U. S portion of the Great Lakes. It does not contain the Rideau Canal, Trent-Severn Waterway, Georgian Bay or North Channel. Those NDI-Digital Ocean charts must be purchased separately. The CD is still a terrific buy as it contains all the rest of the charts needed to do the Great Loop the conventional way even though it does not cover any "side trips" such as the upper part of the Ohio, Mississippi or Tennessee Rivers, Potomac River, etc. Those also must be purchased separately if you want to cruise off the Loop. For more information contact us or go to the website at www.softcharts.com. Ron & Eva Stob, Directors America's Great Loop Cruisers' Association Website: www.greatloop.com