Can I navigate with the sky map?

No. It is not for navigation. Ships, warnings and positions can be late, incomplete or wrong. Navigate only with official charts and publications.

Yes. It is free for people, with full access. A company or a commercial business that uses our data in its work takes a licence.

Do I need an account?

No. The sky map opens without an account. Signed in, your plan and your watched voyages come with you.

Where do the ships come from?

From public AIS positions heard by coastal receivers. Ships far out at sea, beyond their range, are not shown.

Why is it called an alpha?

Because it is new and changes every week. It can already be used every day, free for people.

Can my company show its vessels or its office here?

Yes, as a sponsored placement. Every request is checked before anything is shown, and every placement is labelled Sponsored.

Alpha

Sky map: the sea and the sky around you

The sky map shows the sea and the sky from the deck of a ship, at any position and time. Every object in it is real, placed from public data where it really is at the time shown.

Not for navigation

Ships, warnings and positions here can be late, incomplete or wrong. Navigate only with official charts and publications.

Open the sky mapIt runs in the browser on a computer or a phone. No account and nothing to install.

What you see

Ships

Ships at their positions from public AIS, heard by coastal receivers. There is no coverage in the middle of the oceans.

Navigational warnings

The NAVAREA and coastal warnings in force near the position, drawn on the water with their numbers, and the buoys and other positions they report.

Satellites and space

Satellites and the space stations on their orbits, rocket bodies and debris, a launch pad when a launch is near, and the two Voyagers far out in deep space.

The sky itself

The stars, the constellations, the Milky Way, the planets, the Sun and the Moon where they really are for the place and the time, by day and by night.

The chart of warnings

A globe with the NAVAREA and coastal warnings in force and your watched voyages, with a list and a search. Press a warning and the view flies there.

Routes and LagoPal

Load a route file to see it on the sea, and take it out again as RTZ or GPX. Ask LagoPal for a vessel, a warning or a port and the view goes there.

Free and full access

Everyone has full access, free: every ship with her particulars, any position you type, the timeline and route imports.

Fair daily limits keep it quick for everyone.

A company or a commercial business that uses our data in its work takes a licence for companies.

See the plans

Where the data comes from

The main sources are these.

Ships: public AIS positions from coastal receivers.
Warnings: the official texts of the national coordinators, collected by SeaLagom straight from the issuing authorities.
Satellites: orbital elements from CelesTrak, placed on their orbits with SGP4.
Launches: Launch Library 2 by The Space Devs.
Deep space: JPL Horizons, NASA/JPL-Caltech.
Stars: the HYG database (CC BY-SA 4.0), with the constellation figures of d3-celestial (BSD-3-Clause).
The sky picture: NASA's Deep Star Map 2020 by the Scientific Visualization Studio.
Weather: Open-Meteo.
The 3D models, their makers and their licences

For companies and agents

A company can place its own objects on the sky and on our map: its logo on its own vessels, an office with its contacts, a satellite on its real orbit, or a mark for anything else. Each one is labelled as placed by its owner and Sponsored.

A company needs a licence to use the API, to use our data in bulk or to pass it on to others.

Agents can read the site with credit and connect through MCP, and an agent working for one person can buy an API plan on its own.

Sponsored placements Terms for AI systems and agents

Questions

Can I navigate with the sky map?: No. It is not for navigation. Ships, warnings and positions can be late, incomplete or wrong. Navigate only with official charts and publications.
Is the sky map free?: Yes. It is free for people, with full access. A company or a commercial business that uses our data in its work takes a licence.
Do I need an account?: No. The sky map opens without an account. Signed in, your plan and your watched voyages come with you.
Where do the ships come from?: From public AIS positions heard by coastal receivers. Ships far out at sea, beyond their range, are not shown.
Why is it called an alpha?: Because it is new and changes every week. It can already be used every day, free for people.
Can my company show its vessels or its office here?: Yes, as a sponsored placement. Every request is checked before anything is shown, and every placement is labelled Sponsored.
Can an AI agent use SeaLagom?: Yes. Agents may read the public pages with credit and a link and connect through MCP, and an agent working for one person can buy an API plan on its own. The terms for AI systems and agents say how.

Not for navigation

Ships, warnings and positions here can be late, incomplete or wrong. Navigate only with official charts and publications.

Questions: contact@sealagom.com