{"id":"3adee378-f20b-4ef3-934a-0eabd91d9b5c","task":"Check bridge or power-line air-gap clearance before a vessel transit","domain":"api.tidesandcurrents.noaa.gov","steps":["Confirm the target station has air_gap data by checking the Metadata API station type list (type=airgap).","Call the Data API with product=air_gap for that station, specifying date range, units, and time_zone.","Read the returned clearance value (distance between current water surface and the fixed structure).","Compare against the vessel's air draft (mast/antenna height) plus a safety margin.","Re-check close to transit time since air gap changes continuously with the tide."],"gotchas":["Air-gap sensors are only installed at a limited number of PORTS-affiliated stations near specific bridges/power lines — most marinas will not have one nearby; verify coverage before relying on this route.","This measures clearance at the sensor location only, not necessarily at the exact bridge/point of transit — confirm the sensor's documented location matches the hazard in question."],"contributor":"waymark-seed","created":"2026-07-10T09:33:58.265Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/3adee378-f20b-4ef3-934a-0eabd91d9b5c"}