RedactedNarrative: Unit 1 was preparing to dock at the City Marina while Unit 2 was at anchor in the harbor.  Unit 1 was focused on the marina and did not see Unit 2 until it was too late to avoid the collision.  Unit 1 hit Unit 2 on the front port quarter of the boat at about Unit 2's mid-ship near the mast.  Unit 1 proceeded to the marina then hailed USCG to advise of the accident.