RedactedNarrative: Vessel 2 was trying to sail up into Belfast Harbor. Operator 2 lost visual of the channel. Operator 2 was trying to get back into the channel only using the sail. Vessel 2 was passing Vessel 1 on the starboard side. The wind shifted to the North, which pushed Vessel 2 sideways toward Vessel. Operator 2 turned to port to try and clear Vessel 1's bow. This resulted in Vessel 2's bow anchor hitting Vessel 1's starboard side on the bow. Operator 2 notified the local harbor master.