Use the Spyglass to find a ship carrying a lot of metal in AC4 Black Flag

"Gather metal cargo" is the first mission objective in Sequence 3 / Memory 04: Raise the Black Flag


Use your Spyglass to identify brigs carrying a large amount of metal

Also it is best to attack ships that are alone and not those that appear to be part of a group

Next objective[edit]

Sail to Salt Key