"Find Church and his ship 'The Welcome'" is an objective in A Bitter End in Sequence 9
Optional Objectives
Limit Environmental damage - 20%
Walkthrough
Move through the narrow channel at half sail to keep a good pace but avoid the sluggish turns of full sail.
Once you make it through the channel and the ship is sighted, go to full sail to quickly approach it. This look bad but then a Schooner makes it appearance. Time to give chase.