nausika

PUBLIC BETA Mediterranean Sea only during this phase

41° 23′ N · 09° 09′ E bonifacio strait

AI on the water guesses grounded.

Nausika is a connector that gives your AI assistant the one thing it cannot make up: real sea-aware routing on a maritime graph. Plus live marine forecasts, tides, and curated places for sailors. Five-minute setup. No new app to learn.

Connect to your assistant See what changes

the failure mode

Un-grounded AI hallucinates at sea, confidently.

Ask any general assistant to plan a real passage and watch what it does. It invents coves, places marinas inside private property, runs the leg straight across a peninsula, and reports wave heights it cannot possibly know. Same prompt, two answers:

PROMPT

"Plan a passage from Bonifacio to Porto Cervo for Friday morning. Where can I shelter on the way?"

Without Nausika

Same friendly voice. Made-up numbers.

"Sure thing. From Bonifacio, head south-southeast about 22 nautical miles to Porto Cervo, you should be there in about three hours at six knots. Conditions look moderate, wave around 1 to 2 meters. For the night, Cala Verdura on the east side of the Lavezzi is a sand-bottom anchorage, well protected from the northwesterlies."

DATA SOURCE 
no tool call
no live data
numbers from training data

With Nausika

Same friendly voice. Real numbers.

"Sure thing. It's about 31 miles east-southeast, so figure roughly five hours at 6 knots. Friday morning the wind looks WSW 16–20 kt with a 1.2 m wave at 6 seconds. Comfortable enough, just stay at least half a mile clear of the Lavezzi shallows.

For the night, Cala Coticcio on the NE side of Caprera (41.207° N, 9.467° E): sand bottom, well protected from W and SW. You'll sleep through anything that comes from the forecasted quarter."

DATA FROM NAUSIKA 
nausika.routing.leg     31.4 nm ESE · clear of Lavezzi shallows
nausika.forecast        WSW 16–20 kt · wave 1.2 m at 6 s
nausika.places.shelter  Cala Coticcio · W/SW protection · sand

the mechanism

It plugs into your assistant. No new app to learn.

When you ask a maritime question, your assistant calls Nausika's tools the same way it already calls any built-in capability. Real data flows back, with sources. You don't switch contexts: you stay in the assistant you already use.

  1. You ask a real question

    "What's the wind window for next Saturday off Portofino?", typed normally in your assistant.

  2. Your assistant calls Nausika

    It picks the right tool (forecast, routing, tides, places) and passes your question with structured arguments. You don't see this happen; you just get the answer.

  3. You get a grounded answer

    Real legs computed on the sea graph, real conditions from a marine forecast, real places from the Nausika curated database. Citable, verifiable, never invented.

Nausika is built on the open MCP standard, the same plumbing that lets any modern AI client connect to external tools. Works with Claude Desktop, Claude Code, Cursor, Zed, ChatGPT desktop, the OpenAI Agents framework, and any other MCP-aware client.

the toolkit

Four tools. Real data. Cited sources.

Each tool is grounded in a real dataset or a curated database. Nothing is generated. If a value comes back, your assistant can verify where it came from. During this public beta the coverage is the Mediterranean Sea.

Marine forecast

Public marine model

Hourly conditions on the covered waters.

  • Wind, wave height, period and direction, swell components
  • Visibility, surface temperature, gust forecast
  • Up to 7 days ahead, blended from multiple public weather models

Tide data

Public tide model

Hourly heights and high/low predictions where the model has them.

  • Hourly heights, next-high and next-low estimates
  • Honest about coverage: returns nothing where the model is silent
  • Never invented values, never extrapolated past the model's reach

Curated places

Nausika curated database

Marinas, ports, anchorages, fuel, services.

  • Lat/lon, exposure, holding type, services, depth on approach
  • Community contributions reviewed before they go live
  • Tuned for sailors, not for charter brochures

Four capabilities, twenty MCP tools under the hood. See the full catalogue →

see one in action

A single passage, planned with grounded data.

The kind of answer you get when Nausika is connected. This is a representative response: sample values for illustration; real numbers come from live sources at query time.

You

Plan a passage from Bonifacio to Porto Cervo for Friday morning. Where can I shelter on the way?

Assistant grounded by Nausika

Sure, let me lay it out. From Bonifacio (41.388° N, 9.159° E) to Porto Cervo (41.139° N, 9.540° E) it's about 31 miles east-southeast, around five hours at 6 knots. The course holds you at least half a mile clear of the Lavezzi shallows.

For Friday 06:00–10:00 local you're looking at WSW 16–20 kt and a 1.2 m wave at 6 seconds. Tide falling, +0.4 m at the strait, visibility 8 nm. Comfortable enough, but expect about 30 minutes of confused sea where the swell wraps the islands.

For the night, the right pick is Cala Coticcio on the NE side of Caprera (41.207° N, 9.467° E): sand bottom, depth 4 to 8 m, well protected from W and SW, exactly the quarter the wind is forecast to blow from. Pack in early, it's popular.

If the wind builds before you get that far and you need a bail-out, Cala di l'Avena (41.4267° N, 9.2014° E) is a sound mid-route stop: good holding in sand, just open to the south. After Capo Ferro, Cala Garibaldi on the lee of Razzoli is the second backup if the southerly comes in early.

DATA FROM NAUSIKA
routing.leg
Bonifacio → Porto Cervo · 31.4 nm ESE · 5h at 6kt
forecast.marine
WSW 16–20 kt · wave 1.2 m at 6 s · tide +0.4 m
places.shelter
Cala Coticcio · W/SW full · sand · depth 4–8 m

five minutes on Claude.ai

Connect Nausika to your assistant.

Three steps inside Claude.ai settings. No API keys, no SDK. Open the connector dialog, run OAuth, ask a real question. Requires a Claude Pro or Max plan.

  1. Open the custom connector dialog

    From your profile menu in Claude.ai, go to Customize → Connectors and click Add custom connector at the bottom of the page. Or use the direct link to skip straight to the modal.

    Open connector dialog

  2. Add Nausika and authenticate

    Set a display name (Nausika works) and paste the remote MCP server URL below. Click Add, then Connect to run the OAuth handshake with your Google, GitHub, or Apple account.

  3. Turn it on in a chat and ask

    In any chat, open the + menu at the bottom left, choose Connectors, and toggle Nausika on. Then ask something concrete, like "What's the wind window for Saturday off Portofino?". Nausika's tools are invoked automatically when the question is maritime.

Advanced Using a different MCP client?

Claude Desktop, Claude Code, Cursor, Zed, and any other MCP-aware client accept the same streamable-HTTP block. Drop it into your client's MCP server configuration.

questions

The honest answers.

the name

From the Odyssey, the one who tells you where you actually are.

In the Odyssey, when Odysseus washes up on an unknown shore, exhausted and half-drowned, Nausicaa is the princess who finds him on the beach and tells him where he is. Not what he should do, not what to feel. Where he is. We took the name because that's what a grounded assistant should be: the one who tells you the truth about real water.

Built by Andrea di Cagno.

RESPONSIBILITY

Nausika is an informational copilot for recreational marine navigation. It is not a replacement for certified nautical charts, official Notices to Mariners, or briefings from a certified meteorologist. Plan with paper charts at hand, cross-check forecasts before departure, and remain fully responsible for the navigation decisions you make at sea.