# Open Waters AIS

> Open Waters AIS, an MCP server by openwaters.io, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Live AIS vessel positions by MMSI, name, area, or radius, plus coverage. No sign-in, no key.

- Canonical: https://www.anchorterminal.com/tools/openwaters-ais
- Markdown: https://www.anchorterminal.com/tools/openwaters-ais.md (~900 tokens)
- Slim: https://www.anchorterminal.com/tools/openwaters-ais.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/tools/openwaters-ais.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

# Open Waters AIS

> Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: MCP server, by openwaters.io (https://openwaters.io/ais/)
- Listed because: It's published in the registry under openwaters.io, a namespace the registry only gives to whoever proves they control that domain.
- What the official MCP registry says: Live AIS vessel positions by MMSI, name, area, or radius, plus coverage. No sign-in, no key.

## Facts

- MCP registry: `io.openwaters/ais` 0.11.0
- Endpoint: https://ais.openwaters.io/mcp (streamable HTTP)
- Source: https://github.com/openwatersio/aiscast
- Website: https://openwaters.io/ais/
- GitHub stars: 7
- Registry entry updated: 2026-10-03

## Tools

- Tools it lists (6, about 10,288 tokens of context, `tools/list` without credentials over MCP 2026-07-28, checked 2026-10-04 22:25 UTC):
  - `find_vessels_in_area` (read-only): Vessels currently inside a latitude/longitude bounding box, newest report first, with optional kind and ship-type filters. Use for what is in a port, a strait,…
  - `find_vessels_near` (read-only): Vessels within a radius (default 10 NM, maximum 50) of a point or of another vessel's last known position, nearest first, each with distance and bearing from…
  - `get_coverage` (read-only): Where Open Waters AIS is hearing AIS right now: sources with their current delay, stations, freshness, and vessel counts. Pass a bounding box to learn which…
  - `get_vessel_track` (read-only): The positions heard from one vessel over a time range, oldest first, with speed, course, and navigational status. Positions implying an impossible speed for…
  - `get_vessels` (read-only): Last known position and particulars of specific vessels by MMSI (Maritime Mobile Service Identity) or IMO number: the last report heard for each, however long…
  - `search_vessels_by_name` (read-only): Vessels whose name contains the text, case-insensitive, among every vessel the network has heard, each with its last known position. Use to turn a name into an…
- How its tools read to an agent (0 errors, 6 warnings, 0 notes, about 10,288 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):
  - warn TC11 find_vessels_in_area: 1 parameter without a description: bbox
  - warn TC22 find_vessels_in_area: the definition is about 2,031 tokens
  - warn TC22 find_vessels_near: the definition is about 1,994 tokens
  - warn TC22 get_coverage: the definition is about 1,525 tokens
  - warn TC22 get_vessels: the definition is about 1,988 tokens
  - warn TC22 search_vessels_by_name: the definition is about 1,978 tokens

- JSON: https://www.anchorterminal.com/api/v1/tools/openwaters-ais.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming