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Marine Mammals up in the Arctic ....

The very strict regulatory herewith call for a good lookout while moving up north. Most of the offshore vessels would have marine mammal observers on-board, keeping visual look-out for the presence of marine life in the vicinity.
You could use a passive acoustic monitoring systems to detect sounds
in the surrounding waters.

Operating restrictions in the Arctic, in Alaska & Greenland areas are based around migration times. Offshore operations are excluded from protected zones, would require monitoring in other zones to ensure minimal impact to marine life during the Operations.

RADAR TECHNOLOGY radar systems can detect Marine Mammals above the surface,
as when they're on ice and ice pieces.