Hello.
AMC ships are ' Armed Merchant Cruise '
as far as i remember when using the hydrophone, you get a blue line indicated a warship type for this ship. but that applies only for this mission at Blockade of Germany. in all other campaigns, AMC ships are treated as a merchant ship where you will see a black line when using hyrophone. i guess you can see her at game museum. do this so you can spot it more easily at campaign.
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