North Pacific with Aleutan chain is probably a border of effective carrier operations. Bering Sea is nightmare for carrier operation mainly because thick ice that would cup on flight deck every night.
Border of ice pack would be probably also border of any effective flight operations from carrier.
Scout carrier with 3 squadrons... hmmm. If we take Brits plane maybe something like this:
1 squadron of Gladiators
1 squadron of Skuas
Additional number of Walrus or Seafoxes