There is a Natural Resources Canada program called Seabed Mapping designed to provide the information that you are requesting. It is true that in Canada, the seabed is now mapped to this scale, but in terms of knowledge for vessel skippers, there are certain areas that are well known, like the St. Lawrence River, but many regions remain uncharted.
So the department has this program that allows us to study this issue and produce detailed maps, which will be necessary with a view to increasing traffic.