Shipping remains the most important mode of transportation for goods even though navigation is possible only four months of the year during the ice-free period. The re-supply of oil and other basic products from the south is done mostly by sea. The mining and fishing industries also use shipping.
The mining industry and the exploitation of renewable resources, such as fishing, are still the biggest users of shipping on a large scale. Iqaluit, Nanisivik, Rankin Inlet and Cambridge Bay are the ports with the largest quantities of merchandise transshipped during the four to five months of operation permitted by ice cover.
The Atlantic Ocean on the east coast, Hudson Bay, Parry Channel and Hudson Strait, Franklin Strait and Victoria Strait continue to be the most commonly used shipping routes. Montreal is an important departure and arrival point for trade in goods with Nunavut.