Using Sailseer in Claude and ChatGPT
as of 07/10/2026 · 2 min read
In short: Claude and ChatGPT can plan with Sailseer directly: they search harbours, calculate routes and weather windows, check tides and formalities and show the result as a map in the chat, with a link into the full planner on sailseer.com.
What can Sailseer do in the chat?
In the chat Sailseer calculates the same as on sailseer.com, with the same data: nine weather models in consensus, official warnings, about 8,900 harbours and the route network over real water depths.
- Search harbours by name, area or position, with depth, guest berths, VHF channel and services
- Harbour details with a draft check, anchorages and nearby harbours
- Routes by water with distance, passage time, bridges and locks with opening times, restricted areas and border crossings, as a map and as GPX for the plotter
- Passage rating from 0 to 100 with the reasons: every deduction with its points and leg, wind, gusts, waves, tacking, current and official warnings, plus the alternatives: better departures with the difference in points, other routes and bail-out harbours
- Sailing conditions: whether a day sail around a harbour is worth it, rated for each part of the day
- 10-day outlook, tides with high and low water, multi-day cruises with daily legs and the entry rules of about 120 countries and territories
The complete list is under What Sailseer can do.
How do I connect Sailseer to Claude?
In Claude, open the connectors in the settings, search the directory for Sailseer and connect it. Claude also suggests Sailseer by itself when a question about passage planning fits. Without a directory entry, use "Add custom connector" with the address https://sailseer.com/mcp. No Sailseer account is needed.
How do I connect Sailseer to ChatGPT?
In ChatGPT, open the apps in the settings, search for Sailseer and connect it; ChatGPT also suggests the app during a conversation. In developer mode you can add Sailseer yourself: address https://sailseer.com/mcp, no authentication.
How should I ask?
With start, destination and time, ideally with the boat:
- "When is the best time this week to sail from Kiel to Marstal? We have a 34 ft yacht with 1.9 m draft."
- "Plan a charter week from Split with at most 20 nautical miles a day."
- "When is high water in Cuxhaven tomorrow?"
- "What do I need to enter Greece by boat coming from Turkey?"
What data does Sailseer receive?
Only what the request contains: harbours or positions, departure, boat and language. No chat history, no name and no account. Sailseer only counts how often each function is used, as a daily total. More in the privacy policy.
Frequently asked questions
Does Sailseer cost anything in Claude or ChatGPT?
No. Sailseer is free and needs no account, in the chat too. Which connectors and apps your Claude or ChatGPT plan includes is decided by Anthropic and OpenAI.
Does Sailseer calculate the same in the chat as on the website?
Yes. The chat calls the same planner and the same weather as sailseer.com. Every answer contains a link that opens the route or harbour in the Sailseer map, with all layers, the chart and the sailing mode.
Can the planning in the chat be used for navigation?
No. Sailseer is a planning aid. Official charts, sea weather reports and notices to mariners take precedence.