A sunken or stranded vessel, or part of one, recorded with position, least depth where known, and a category such as dangerous, non-dangerous or showing hull or mast. Surveys investigate charted wrecks to confirm or update them and report new ones promptly. Masts, booms and rigging are thin targets that sonar can miss, so wreck investigations often combine multibeam, side-scan and divers.
Wreck's sitting upright with the mast up to 4.2, that's a DtoN at this depth.
Also heard as
- wreckage
Related terms
Least depth
The shallowest depth over a wreck, rock or other feature, which is the value that gets charted.
Obstruction
A submerged object that hinders vessels or fishing and is not a wreck or natural rock, such as piles or debris.
DtoN
Danger to navigation: a newly found hazard reported urgently so charts and warnings change before the survey ends.
Contact
A target picked out of side-scan or multibeam data that may be an object worth investigating.
S-57
The international data transfer standard behind most electronic navigational charts, built on objects and attributes.