OhMyWind MCP running

Talk to your LLM. Cast off with confidence.
A free, keyless, open-source sailing planner for any coast, with high-precision tidal currents on the French Atlantic. Exposed as an MCP server so any compatible assistant can use it.

OhMyWind passage plan: 5 waypoints, 48.6 nm, ETA 21:24, complexity 3 of 5.

Connect it to your assistant

Pick yours below — under a minute, no install, no API key.

Claude (claude.ai)

Open claude.ai → Settings → Connectors.
Scroll to the bottom and click Add custom connector.
Set Name: OhMyWind.
Paste this in Remote MCP server URL:
```
https://mcp.ohmywind.fr/mcp
```
Click Add. In any new chat, OhMyWind shows up in the Search and tools menu — toggle it on.

Le Chat (Mistral)

Open chat.mistral.ai and sign in.
In the left sidebar, open Intelligence → Connecteurs (in English: Intelligence → Connectors), then click Add MCP server.
Set Name: OhMyWind · Auth: None.
Paste this in URL:
```
https://mcp.ohmywind.fr/mcp
```
Save, then enable the OhMyWind toggle inside any conversation.
Le Chat doesn’t (yet) support the MCP Apps spec, so the widget won’t render inline — the assistant will hand you an ohmywind.fr deep-link instead.

ChatGPT (OpenAI)

Requires ChatGPT Pro, Business, or Enterprise (custom connectors).
Open ChatGPT → Settings → Connectors.
In Advanced, turn on Developer mode.
Back in Connectors, click Create.
Set Name: OhMyWind · Authentication: No authentication.
Paste this in MCP server URL:
```
https://mcp.ohmywind.fr/mcp
```
Trust the connector and save. Activate it in a chat via + → Developer connectors → OhMyWind.

Then ask, in your own words

I'm leaving Marseille tomorrow morning for Porquerolles on a Sun Odyssey 36. How long is the passage and how tricky is it?

Your assistant calls the OhMyWind tools and answers in plain language. On hosts that support the MCP Apps spec (Claude, Claude Desktop, ChatGPT, VS Code Copilot, Goose, Postman, MCPJam), the live ohmywind.fr plan view also renders inline as a sandboxed iframe. On hosts that don’t (Cursor, Le Chat, terminal), the assistant hands you the same plan as a deep-link instead.

Or to compare a whole weekend’s worth of departure windows in one shot:

Marseille → Porquerolles, same boat — show me the calmest departure between Saturday morning and Monday evening.

Why OhMyWind

Free & keyless. Wind + sea via Open-Meteo (CC BY 4.0).
Mediterranean-tuned. AROME 1.3 km by default; ICON-EU → ECMWF → GFS for longer reach.
Boat-aware. Seven archetypes from 20 to 50 ft, real polars, an efficiency parameter for trim and crew level.
Window-aware. One call sweeps up to 14 days of hourly departures so the LLM can pick the calmest slot.
Client-agnostic. One HTTP MCP endpoint. No vendor lock-in.
Open source, MIT. Self-host on Fly, Modal, your VPS.

Four tools

The workhorse is plan_passage: one call returns timing, a 1-5 complexity score, and an ohmywind.fr deep-link. It declares an MCP Apps UI resource, so supporting hosts also render the live plan view in a sandboxed iframe. Pass latest_departure and it walks every hourly window up to 14 days out so the LLM can compare side-by-side. The other three tools — list_boat_archetypes, get_marine_forecast, read_me — let the assistant pick a boat, sample the forecast ad hoc, or explain the math behind a result.

Don’t want to wire an MCP host? You can also drive everything by hand at ohmywind.fr/plan — click your route, pick a boat, slide the departure.

Source

Project site: ohmywind.fr · GitHub: qdonnars/ohmywind (MIT).

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