RedactedNarrative: Vessel 1 (V1) was inbound to shore from a recreational night fishing trip.  While in the visinity of Rock Harbour, V1 collided with vessel 2 (V2).  V2 was moored in a well known anchorage area in Key Largo. V2 was pointing east northeast, accoording to the prevailing winds in the area that night.  V1 struck V2 on its starboard side near the bow,  causing extensive damage to the fiberglass hull. V2 anchor light was on an operational.  Operator of V1 failed to see the single mast anchor light as it blended with the presence of background lights on the shore line, a factor on this collision.