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Open Waters

Open-source marine tools that plot nautical charts, seafloor depth maps, tide predictions, live vessel traffic and sun/moon almanac data.

Actively maintained

Developer toolsOpen sourceFor developers
openwaters.io ↗GitHub
Open openwaters.ioAlternativesSet it up for my teamIs Open Waters yours? Claim the card →
At a glanceswept Oct 15, 2026

≈ 5visits/mo

Little sign of use · estimate, read Oct 15, 2026

For
Mariners, developers and ocean enthusiasts working with open marine charts, tides and vessel traffic
Activity
Actively maintainedsite updated 6 days ago
Company
Open Water Software, LLCprivacy policy
Runs as
API
Used for
  • look up tide predictions for stations worldwide
  • view depth contours and seamarks on nautical charts
  • track live vessel traffic within a chosen area
Worth knowingcomputed from what we read · each with its source
The companyeach fact with its source · read Oct 20, 2026
  • HeadquartersGreen Cove Springs, USper their site
Your datawhat they publish, each line with its page · read Oct 20, 2026

These are Open Waters's own statements, read from its pages. We did not audit them. A line that is missing was not found on the pages we read; it does not mean the practice is absent.

How a program reaches itfound, not claimed · read Oct 20, 2026
  • MCP serverio.openwaters/aisverified in the MCP registry
  • Stateanswers, 6 toolschecked 2026-10-20
  • Address to connectais.openwaters.io/mcp
  • OpenAPI spec19 pathsthe spec ↗
  • API docsopenwaters.io/apithe vendor's page ↗

MCP server details →

This card as JSON, for your agent →

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.

Most used in Developer toolsby use, among tools still maintained — this tool shares no tags yet

Figure and bar: visits/mo, estimate · year: online since

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Questions this page answers
  • What is Open Waters?

    Open-source marine tools that plot nautical charts, seafloor depth maps, tide predictions, live vessel traffic and sun/moon almanac data. It is listed in the Atlas under Developer tools and made by Open Water Software, LLC.

  • Who is Open Waters for?

    Mariners, developers and ocean enthusiasts working with open marine charts, tides and vessel traffic

  • Do people use Open Waters?

    Little sign of use: ≈ 5 visits/mo · estimate, 2026-10.

  • Is Open Waters still maintained?

    Actively maintained: site updated 6 days ago.

  • Who owns Open Waters?

    Open Waters is run by Open Water Software, LLC, per its privacy policy (2026-10-20).

How we read a tool

No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.

  • Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
  • Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
  • Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
  • The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.

How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.

How we read every tool → · By INITE Atlas Desk