V1 was underway southbound on the ICW in the Indian River Lagoon.  V1 attempted to transit under the 192 Melbourne Causeway bridge and the top portion of V1's mast made contact with a section of the bridge resulting in damage to the mast and instruments attached to the mast.  Operator stated that while underway, he noted the bridge waterboard showed a vertical clearance of 64.5 feet at the time of the accident.  The vessel's mast clearance from the waterline is 63 ft 3 inches (measured).  Inspection of damage after accident shows the cable impacted  the mast at a measured height of 62 ft 8 inches.
MELBOURNE