Cosmic's Coast Map › For AI assistants
MCP server · JSON API
Ask your assistant what the water will be like
The Coast Map works inside Claude, ChatGPT and any other assistant that speaks the Model Context Protocol: tide times, slack water, wind and waves, marine warnings and water temperature for your launch, from official sources. One URL, no sign-up, free.
https://coast.cosmicotter.ca/mcpConnect it
Settings → Connectors → Add custom connector. Name it "Coast Map" and paste the URL above.
Settings → Apps & Connectors → Advanced, turn on developer mode, then create a connector with the URL above.
One line in a terminal:
claude mcp add --transport http coast-map https://coast.cosmicotter.ca/mcp
Add a remote (streamable HTTP) server:
{ "mcpServers": { "coast-map": {
"url": "https://coast.cosmicotter.ca/mcp" } } }Menu names in each assistant change from time to time; look for "connectors", "custom connector" or "MCP server".
Then just ask
Tools
| Tool | What it answers | Access |
|---|---|---|
plan_paddle | Everything for one launch in one call: the nearest tide station with 2 days of highs and lows, currents nearby, the next 24 hours of wind, gusts and waves, warnings in effect, water temperature and sunrise and sunset. | Free |
find_stations | The nearest tide and current stations to a point, with distance and time zone. | Free |
tide_times | High and low tides with heights, in the station's local time. | 7 days free 90 with pass |
currents | Slack water and maximum flood and ebb, times and speeds. | 7 days free 90 with pass |
best_low_tides | The lowest daylight low tides coming up, marking the good ones for clamming, foraging and tide pools. | 30 days free 90 with pass |
marine_forecast | Hourly wind and gusts in knots, rain, fog and thunder risk for 48 hours, plus wave height and period (Environment Canada, the US National Weather Service or MET Norway). | Free |
marine_warnings | Gale, storm, small craft and other marine warnings in effect for the forecast area. | Free |
water_temperature | From the nearest buoy, or satellite sea surface temperature. | Free |
coast_map_pass, start_pass_purchase, pass_status | What the pass adds, and (once it's on sale) buying it inside the conversation. | Free |
Every answer says how fresh its forecast is (as_of). These are predictions for planning, not for navigation: carry charts and check the official forecast and warnings before you go.
The Coast Map Pass
Everything above is free for now. The Coast Map Pass (CA$7 a month or CA$55 a year, no account) is coming: it will add tide and current ranges up to 90 days for assistants, and offline regions in the app for trips with no signal. When it's on sale, your assistant can sell it to you in the chat; if you already have a key, send it as a header:
Authorization: Bearer <your pass key>
JSON API
The same tools as plain HTTPS. The tool list is at /api/v1 and the OpenAPI 3.1 description at /api/v1/openapi.json.
curl "https://coast.cosmicotter.ca/api/v1/tide_times?lat=49.15&lng=-125.9&days=2"
Limits: 120 requests a minute per address (60 for the marine forecast). Kayak outfitters, tour operators and apps that need more can email brendon@cosmicotter.ca.
Questions
Do I need an account or API key?
No. Paste the URL and ask.
Which coasts does it cover?
Official tide predictions for Canada, the US, Norway, Ireland, the Netherlands, New Zealand and Queensland, tables fitted to gauge readings in the UK and France, and modelled tides elsewhere. Wind, waves and water temperature work anywhere on the water.
Where does the data come from?
The Canadian Hydrographic Service, NOAA, Kartverket, Rijkswaterstaat, LINZ, the Marine Institute and other national agencies for tides; Environment Canada, the US National Weather Service and MET Norway for wind, waves and warnings. Sources and terms.
What do you keep about my requests?
Counts of which tools are used, for rate limits and to see what's useful. No account, no names; the places you ask about aren't tied to you.