Just landed in Barrow, Alaska, completing the passage. In reality, the whole area which I crossed is currently covered with sea ice: http://arctic.atmos.uiuc.edu/cryosphere ... shade.html
However, being an ekranoplan, the Sea King is just as capable of flying over sea ice as over open water, although the occasional "hop" over rough areas might be necessary. It isn't clear if the ice is thick enough to land a craft the size of the Sea King on it (I would guess not), so I limited myself to landings on actual land, making stops at Sept Ilês, Quebec; Cartwright, Labrador; Hall Beach, Nunavut; Resolute Bay, Nunavut; and Barrow, Alaska.
Whoever invented thrust reversers should win a Nobel prize.