For those who are agitating for expansion of the country's exclusive economic zone (EEZ), here's a useful story from CBC.
Call it custodial management, call it what you will, the first step will be extending the claim to subseabed resources according to the United Nations Convention on the Law of the Sea (UNCLOS).
The mapping work currently being done in order to stake the claim legally will also make it easier for Canada to control development of any oil and gas resources that may lie beyond the 200 mile EEZ.