{"id":"S85002544","label":"Aids to navigation","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85002544","normalized_label":"aids to navigation","broader":["http://id.loc.gov/authorities/subjects/sh85081272","http://id.loc.gov/authorities/subjects/sh85090425","http://id.loc.gov/authorities/subjects/sh85122402"],"aliases":["ATON (Aids to navigation)","Marine aids","Marine signals","Navaids","Navigational aids (Nautical)"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85002544","provider":"lcsh","revision":"1ce17882346d6282","taxonomy_revision":"f050b5d4780b1289","title":"Aids to navigation","url":"/topics/S85002544","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"10088067563360749056","address_version":"morton4x16-v1","coordinates":[0,20,17444,49152],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}