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Third-party notices

chartplotter is licensed under the MIT License, © 2026 Jeremy Collins.

The program bundles, embeds, links, or builds on the third-party software and data listed below. Each remains under its own license. This file is informational; the upstream license text governs.

libtile57 (the native chart engine)

The binary statically links libtile57, the native S-57/S-101 chart engine built from the sibling tile57 repository. tile57 is MIT-licensed, © 2026 Jeremy Collins.

tile57 carries its own third-party inventory in its THIRD_PARTY_LICENSES.md, which covers the components compiled into libtile57 — and therefore into every chartplotter binary — including vendored Lua (MIT), nanosvg (zlib), stb_image_write (public domain / MIT), an embedded Noto Sans face (SIL OFL 1.1), ported algorithms, and the IHO S-101 catalogues (see the IHO section below).

Go dependencies

All are permissive (MIT or BSD-3-Clause). None are copyleft.

Module License
github.com/BertoldVdb/go-ais MIT
github.com/adrianmo/go-nmea MIT
github.com/alecthomas/kong MIT
github.com/dustin/go-humanize MIT
github.com/mattn/go-isatty MIT
github.com/ncruces/go-strftime MIT
github.com/google/uuid BSD-3-Clause
github.com/remyoudompheng/bigfft BSD-3-Clause
golang.org/x/image BSD-3-Clause
golang.org/x/sync BSD-3-Clause
golang.org/x/sys BSD-3-Clause
modernc.org/libc BSD-3-Clause
modernc.org/mathutil BSD-3-Clause
modernc.org/memory BSD-3-Clause
modernc.org/sqlite BSD-3-Clause

Regenerate this list from a built binary with go version -m bin/chartplotter (the module graph in go.mod includes a few indirect and test-only modules that are not linked into the binary).

Bundled web assets

Asset Where License
MapLibre GL JS v5.24.0 web/vendor/maplibre-gl.js BSD-3-Clause
Noto Sans glyphs web/glyphs/ SIL Open Font License 1.1 (full text: web/fonts/OFL.txt)
OpenBridge icons web/src/lib/openbridge-icons.mjs Artwork CC BY 4.0; code Apache-2.0

OpenBridge attribution, as required by CC BY 4.0: "Icons from the OpenBridge Icon Pack by the Ocean Industries Concept Lab, CC BY 4.0."

Bundled data

GSHHG coastline basemap

web/basemap/coastline.geojson is derived from the GSHHG shoreline data set (A Global Self-consistent, Hierarchical, High-resolution Geography Database) by Paul Wessel and Walter H. F. Smith, distributed under the GNU LGPL. Only the GeoJSON is tracked in this repository; the viewer can optionally load a tiled basemap/coastline.pmtiles derived from the same data if you provide one. The offline basemap underlay is optional.

NOAA ENC data and catalog

chartplotter reads NOAA S-57 ENC cells and ships a distilled product catalog (web/catalog.json, derived from NOAA ENCProdCat.xml). NOAA charts are works of the U.S. Government and are in the public domain. They carry NOAA's standard disclaimer: the data is not to be used for navigation.

Two NOAA cells are tracked in this repository as test fixtures: testdata/US4MD81M.000 (with its .001–.003 update files) and testdata/US5MD1MC.000.

S-57 attribute table (from GDAL)

internal/s57/parser/s57attributes.csv is the S-57 attribute catalogue from the GDAL project (https://gdal.org), licensed MIT/X11. The acronyms and codes it contains originate from the IHO S-57 Object and Attribute Catalogue.

IHO S-101 Portrayal Catalogue and Feature Catalogue

License status: undeclared. The IHO publishes these catalogues with no license statement, so redistribution rights are not formally cleared — treat this as a known open item. The project nonetheless distributes binaries that embed the catalogue as an accepted position; if the IHO clarifies or objects to its terms, this section and that decision must be revisited.

chartplotter portrays charts using the IHO S-101 Portrayal Catalogue and Feature Catalogue (the symbols, color profiles, drawing rules, and feature definitions). These materials are © the International Hydrographic Organization (IHO).

Source repositories (public, but no license declared — license: null, i.e. all rights reserved):

How the project handles them — fetch from the IHO at build, embed, and distribute the built binaries:

  • Not in either repository. Neither this repo nor tile57 commits any IHO catalogue content. The tile57 repo references the two IHO repositories above as git submodules (vendor/S-101_Portrayal-Catalogue, vendor/S-101-Documentation-and-FC), so git submodule update --init --recursive fetches the material directly from the IHO's own repositories onto the builder's machine.
  • Embedded in every binary. Building libtile57 compiles the fetched catalogue into the library, and every chartplotter binary links libtile57 — so any built binary embeds IHO material, whether built locally or on CI.
  • Distributed in published binaries. Tagged releases publish per-platform chartplotter binaries built on CI, where the runner obtains the catalogue from the IHO's own repositories at build time. Those released binaries therefore embed IHO material, and the project distributes them as an accepted position despite the undeclared license.

The IHO copyright and reproduction policy is at https://iho.int. If the IHO clarifies (or objects to) the catalogues' redistribution terms, this section — and the decision to distribute binaries — must be revisited.