Tides
GET /v1/tides
Heights, high & low water and a 7-day curve for any coordinate — reduced to LAT, from our own global model.
Tidal & coastal data · one key
Predict the water.
Predict the water.
Read the fairway.
Tides and currents worldwide, plus Europe's gauges, navigational notices, locks and harbour shelter — from 36 official sources — consolidated, monitored and continuously maintained. One key, one format, every source attributed.
EU-hosted
Own calibrated model
Attribution in every response
GET/v1/tides?lat=53.55&lon=6.72200
Now
2.34 m
Next HW
14:12 · 2.41
Next LW
20:39 · 0.38
Datum
LAT · fes2022b
Six modules · one endpoint family
Every layer of the chart, addressable.
Scopes are booked individually. Each response is coordinate-based, edge-cached and carries its source and licence.
worldwide
Currents
GET /v1/currents
Tidal set & drift with slack and maximum flood/ebb — the safety layer for races like Marsdiep or the Alderney Race.
Water levels
GET /v1/levels
1,185 measuring stations from 10 official networks — water level, waves and sea temperature in one format, the real-time complement to the prediction.
Area notices
GET /v1/warnings
Fairway & shipping notices for the area, consolidated from public authorities and machine-translated.
Locks
GET /v1/locks
3,392 locks across 9 countries with dimensions, VHF channel and live operating hours.
Harbour shelter
GET /v1/shelter
For 24,693 marinas, computed from which directions they are sheltered by land — a measure of how sheltered a berth is for a given wind direction.
Why Neptun
Marine data is scattered across a dozen national services, in a dozen formats, under a dozen licences. Neptun consolidates it into one interface. Computed values from an in-house model, official holdings with full attribution — no reselling of third-party feeds.
01
36 sources in continuous operation
Wiring up one source is a day's work — operating 36 of them is the ongoing cost: services go down, change format, list 24 locks under the same name. Each source is measured on when it last delivered content, published openly on the coverage page.
02
EU-hosted, one invoice
Servers in the EU, GDPR-compliant, billed through a merchant of record — VAT is handled there.
03
Licence-clean by design
Every payload names its source. Source-restricted data is automatically excluded from paid answers.
04
Our own calibrated model
Tides and currents run on FES2022b/FES2014a, calibrated against public observations — an in-house computation, not a licensed passthrough.
Public docs · no account needed
A request you can read.
Bearer key or query param, sensible defaults, honest errors. Scopes and a daily quota per key — check usage at
REST · JSON
curl-freundlich
OpenAPI /docs
Request a coordinate, receive the prediction together with its provenance. The same interface serves the sailing app Rubberduck in production.
# the request behind the curve above $ curl https://neptun.marine-api.com/v1/tides \ -H "Authorization: Bearer mapi_live_…" \ -d lat=53.55 -d lon=6.72 { "datum": "LAT", "source": "fes2022b", "confidence": "coastal", "extremes": [ { "type":"HW", "height_m":2.41 }, { "type":"LW", "height_m":0.38 } ], "attribution": "FES2022b © CNES/LEGOS/AVISO" }
Sources & licensing
Every value, traceable.
Every response carries its source. Third-party official data is never presented as our own.
Tidal and current predictions derived from FES2022b (tides) and FES2014a (currents) — © CNES/LEGOS/AVISO.
DOI 10.24400/527896/A01-2024.004
Official networks (levels, notices, locks)
Area notices — covered regions
German coast & inland
Netherlands & inland EU
British Isles
Baltic Sea
Atlantic & Iberia
Mediterranean
Worldwide
Each under the publishers' respective open licences. Model values — not for navigation. Source-restricted data is excluded from paid responses. Processed by © rubberduck software.
Coverage
Where Neptun delivers
Toggle a module — glowing points show its coverage.
Tides & currents (global)GaugesNotices (EU + US + global)Locks (EU inland)
Pricing · VAT handled
Billed by focus, not for the whole platform.
Two focused packages — tides or coastal intelligence — or all modules under one key. Free tier for development and non-commercial use.
Prices incl. VAT · via Merchant of Record · cancel monthly · no card for Free · higher volume and SLA (Enterprise) on request