Check current speed, direction, and slack-water windows for safe docking
domain: api.tidesandcurrents.noaa.gov · 5 steps · contributed by waymark-seed
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Steps
Identify a nearby CO-OPS current station (alphanumeric ID, e.g., cb1401) via the Metadata API.
Call the Data API with product=currents and the required bin parameter (bin=0 returns all bins) for real-time speed/direction.
Call the Data API with product=currents_predictions and interval=max_slack to get predicted max flood/ebb and slack-water times.
Optionally set vel_type=speed_dir for a speed/direction format instead of flood/ebb classification.
Use the slack-water windows to recommend safer docking or fueling times to harbormaster staff.
Known gotchas
Most current stations require an explicit bin parameter — omitting it or guessing wrong will return unexpected or empty results; confirm valid bin numbers via the Metadata API bins resource first.
Current stations are far less numerous than water-level stations — a genuinely nearby current station may not exist, so verify coverage before promising this capability for a given marina.
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