A layered system protects Atlantic sea lanes from raiders

With R-class equivalents escorting convoys and hunter groups searching for raiders, what else would protect the sea lanes?

Escort-carrier reconnaissance, cruiser and armed-merchant-cruiser trip wires, and submarines watching enemy coasts would provide more coverage. Fast forces could reinforce threatened convoys.

Sea-lane protection can aim at controlling the whole sea or securing the water around each convoy. An R-class equivalent accompanies an important convoy, while escort-carrier aircraft search around it for raiders. Fast carrier groups hunt farther out, with a group at sea available to reinforce a threatened convoy. Cruisers and armed merchant cruisers act as trip wires, and submarines watch the enemy's coast for departures. Some raiders would still get through, so success depends on keeping their numbers too low to pose a serious threat. A major enemy sortie would justify concentrating the hunting forces once the surveillance network had located it.