Mission question - blockade of germany

[Fidd]

Im in late '39, and am required to sink 1 aircraft carrier (done) and "5 AMC ships" along the arc to the NW of Scotland associated with this mission.

What exactly are "AMC ships"?

MTIA

Fidd

[Hardigen]

Armed Merchant Cruisers

[Der:Alte]

:up:

[Dive! Dive! Dive!]

If you are having problems finding them then I would recommend convoys.