RedactedNarrative: On Sunday, November 11, 2018 at approximately 10:30am, operator was operating his catamaran in the Croatan Sound as part of his journey from Rhode Island to Florida.  Operator's wife was also onboard assisting with course navigation. They consulted an online app they used for navigation and believed they were in the ICW and therefore would have sufficient clearance to travel beneath all bridges.  Their app also stated the clearance for the Hwy 64/264 bridge as being sufficient to clear the approximate 50' mast on their vessel.  When they encountered the William B. Umstead bridge between Manns Harbor and Roanoke Island, they did not see any visible clearance markings but believed they would be able to make it under the bridge since they were in the ICW.  The mast did not have sufficient clearance and struck the bridge causing it to topple over onto the boat.  Operator later learned he was in an alternate ICW route with lower clearance bridges.  There were no injuries and PFDS were available but not worn by the occupants.
  
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