sailing-mcp

Remote MCP server for sailing navigation — forecasts, tides, currents, marinas, bridges and live AIS. Connect once, use across Claude.ai, Claude Desktop and Claude Code.

Endpoint

POST https://sailing-mcp.dutch-atlas.com/mcp

Transport: Streamable HTTP (MCP spec). Stateless — no sessions, no state on the server.

Tools

Tool	Provider	Key
sailing_forecast_openmeteo	Open-Meteo (ECMWF, GFS, ICON, UKMO, Météo-France, JMA) + Marine API for waves + optional SST.	free
wind_consensus	Multiple models side-by-side with min/max/spread. Shows forecast uncertainty at a glance.	free
metar_taf	Real airport observations (METAR) + terminal forecast (TAF). Cross-check forecast vs. ground truth at EHKD, EHAM, EGSH, …	free
sun_moon	Sunrise/sunset, civil/nautical/astronomical twilights, moonrise/moonset, phase, illumination.	free
tides_nl	Preferred for Dutch waters. Matroos / RWS — HW/LW, astronomical, observed, RWS forecast, surge component, water temperature.	free
tides_rws	RWS Waterinfo — observed only (alternative source if Matroos is down).	free
marinas_osm	Marinas, harbours, yacht clubs, anchorages, slipways and fuel within a radius — OpenStreetMap via Overpass.	free
bridges_nl	Scheduled bridge openings on Dutch waterways, with bridge names resolved from OpenStreetMap. Source: NDW DATEX II feed (refreshed every 5 min).	free
notices_nl	Official Notices to Skippers (RWS / EU NtS) — obstructions, works, closures, water/ice/weather notices, geo-filtered to a radius. Dutch text.	free
fairway_nl	Fairway depths, bridge passage heights (air draft) and locks from the RWS Fairway Information Service WFS. "Will my keel/mast fit?"	free
checklists	Curated sailing checklists: bareboat charter check-in, crew safety briefing, pre-departure checks, heavy-weather prep, charter check-out. Always delivered in full.	free
ais_traffic	Live vessel snapshot via AISStream.io — MMSI, name, type, position, course, speed, destination within a radius.	aisstream key
sailing_forecast / point_forecast	Windy Point Forecast API. The free Windy tier returns shuffled data — get a paid key from api.windy.com for real numbers.	windy key
tides_worldtides	Global tide predictions (high/low water times, 30-min height series) from worldtides.info.	worldtides key
currents_stormglass	Tidal / ocean currents from stormglass.io, multi-source (sg, meto, fmi, fcoo, noaa). Free tier: 10 req/day.	stormglass key
list_models	Reference card: available models, parameters, levels, station codes.	free

Tools that require a key only appear in tools/list when that key is present in the URL.

Build your URL

https://sailing-mcp.dutch-atlas.com/mcp

Leave a field empty to skip that provider. Keys never leave your browser — this page is static.

Connect from a client

Claude Code

claude mcp add --transport http sailing "https://sailing-mcp.dutch-atlas.com/mcp"

Claude.ai (Pro / Max / Team / Enterprise)

Settings → Connectors → Add custom connector. Set Remote MCP server URL to the URL above. No OAuth required.

Claude Desktop (any plan, via mcp-remote)

Edit ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "sailing": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://sailing-mcp.dutch-atlas.com/mcp", "--transport", "http-only"]
    }
  }
}

ChatGPT (Plus / Pro / Business)

In the browser at chatgpt.com, signed in:

Avatar menu → Settings → Apps.
Open Advanced settings and turn on Developer mode (it's flagged "elevated risk" — this is what lets you add a custom MCP server).
Back in Apps, click Create app (next to Advanced settings).
In the New App dialog:
- Name: Sailing MCP
- Connection: Server URL
- URL: https://sailing-mcp.dutch-atlas.com/mcp (paste the key-builder URL above if you have provider keys)
- Authentication: No Auth
- Tick "I understand and want to continue", then Create.
The app shows up under Enabled apps. In a chat, open the + / Apps menu and enable Sailing MCP to let it use the tools.

Where to get keys

api.windy.com/keys — Windy Point Forecast (free tier is shuffled; production tier is paid).
worldtides.info/developer — WorldTides API (free 100 credits/day).
dashboard.stormglass.io — Stormglass (free 10 req/day).
aisstream.io/apikeys — AISStream (free, GitHub login).

What to ask the agent

Pre-passage briefing

“Tomorrow morning Den Helder → Texel, give me the full passage plan: wind, gusts, waves, HW/LW at Marsdiep, when to leave and why.”
“Wind consensus across ECMWF / GFS / ICON-EU / UKMO for Saturday at Marsdiep — show where models disagree.”
“Sunrise, sunset and civil twilight at Vlieland for the next 3 days — when must I arrive to dock in daylight?”

Right-now situational awareness

“Current METAR at EHKD — is the forecast holding?”
“What ships are within 5 km of Marsdiep right now? Any TESO ferry inbound?”
“Water level at Den Helder, observed vs. astronomical — is there a storm surge?”

Planning a route

“Find marinas with fuel within 20 km of IJmuiden.”
“List the next bridge openings on the Amsterdam-Rhine canal in the next 6 hours.”
“Anchorages and yacht clubs near Vlieland — anything with a website I can call?”

Cross-checking conditions

“Compare RWS forecast surge to ECMWF MSLP — does the low explain the surge?”
“Currents in Marsdiep for tonight per Stormglass — and is the wind with or against?”
“Sea-surface temperature off Texel — strong enough for a sea breeze tomorrow?”

Health

GET https://sailing-mcp.dutch-atlas.com/healthz  →  {"ok":true}