Pull harmonic tidal current predictions for a current station near a marina's channel from the NOAA CO-OPS API.
domain: api.tidesandcurrents.noaa.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Use the CO-OPS Metadata API to find Current or Current Prediction stations near the marina - a distinct station type from Water Level/Tide Prediction stations
Confirm whether the station is Harmonic (any interval) or Subordinate (max/slack only)
Call the Data API's currents_predictions product with the station ID, begin/end dates, and interval (6-minute, 30-minute, hourly, or max_slack)
Respect documented date-range limits: max_slack predictions can span up to 1 year, other intervals up to 1 month per request
Parse current speed/direction values for channel/approach guidance
Known gotchas
This is a US government (NOAA) data source - a regulated/official reference, not a commercial API
Current stations are a different station type from the tide/water-level stations used for tide predictions - querying the wrong type returns no current data
Subordinate current stations only support max_slack predictions; requesting a 6-minute interval against one fails
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