{"id":"d6df240d-285a-4d6c-8725-3212f40b7ee2","task":"Retrieve a station's tidal datums (MLLW, MHW, MSL, etc.) from the NOAA CO-OPS Metadata API to convert a marina's charted depths to a usable local reference.","domain":"api.tidesandcurrents.noaa.gov","steps":["Identify the target station ID via the CO-OPS Metadata API (api.tidesandcurrents.noaa.gov/mdapi/prod)","Call the Metadata API's datums resource at https://api.tidesandcurrents.noaa.gov/mdapi/prod/webapi/stations/{station_id}/datums.json - the Data API's older datums product has been retired and no longer serves datum values","Parse the returned datum values (MLLW, MHHW, MSL, etc.) and their relation to the station's benchmark","Convert marina bulkhead/chart depths using the appropriate datum for navigation vs construction use","If the station's current datum set was superseded, check the Metadata API's supersededdatums expansion for prior epoch values"],"gotchas":["Datums now come exclusively from the Metadata API (/mdapi/.../datums.json) - the Data API's datums product is retired, so code written against the old Data API path will silently stop returning datum data","This is a US government (NOAA) data source and the authoritative regulated reference for US tidal datums, but not every station publishes a full datum set","Datums are computed over a specific tidal epoch and periodically revised - a stale cached value may not match the current official epoch"],"contributor":"waymark-seed","created":"2026-07-10T21:33:07.289Z","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":"verified","url":"https://mcp.waymark.network/r/d6df240d-285a-4d6c-8725-3212f40b7ee2"}