Data sources & credits

Map © OpenStreetMap contributors · Basemap tiles: OpenFreeMap © OpenMapTiles · Data: 33 CFR Part 117 (eCFR) · FHWA National Bridge Inventory · NOAA Office of Coast Survey (ENC) · © OpenStreetMap contributors · USACE / U.S. Army Geospatial Center (Inland ENC) · U.S. Army Corps of Engineers (National Channel Framework) · YachtBazar · Software: MapLibre GL JS (BSD-3-Clause) · Turf.js (MIT) · Not for navigation.

• OpenStreetMap (basemap tiles via OpenFreeMap / OpenMapTiles) — Open Database License 1.0 © OpenStreetMap contributors Basemap tiles: OpenFreeMap © OpenMapTiles Rendered tiles are a produced work: attribution only, no share-alike on our data.
• 33 CFR Part 117 — Drawbridge Operation Regulations (eCFR) — U.S. Government work — public domain (17 U.S.C. §105) 33 CFR Part 117 (eCFR) Codified text only — temporary deviations are not included.
• FHWA National Bridge Inventory — U.S. Government work — public domain (17 U.S.C. §105) FHWA National Bridge Inventory FHWA states NBI data must NOT be used for route clearance; inspections run on a 24-month cycle.
• NOAA Office of Coast Survey — Electronic Navigational Charts (ENC) — Creative Commons Zero 1.0 Universal Public Domain Dedication NOAA Office of Coast Survey (ENC) Derived display — not an official NOAA ENC and not for navigation.
• OpenStreetMap-derived marina/dock records inside the map pins — Open Database License 1.0 © OpenStreetMap contributors Share-alike surface. Coordinate with the open ODbL remediation before shipping.
• USACE Inland Electronic Navigational Charts (IENC) — U.S. Government work — public domain (17 U.S.C. §105) USACE / U.S. Army Geospatial Center (Inland ENC) USACE IENC: public-domain status is UNCONFIRMED — the service copyright line names production contractor IIC Technologies and no use restriction is stated. Treated as unconfirmed pending USACE/AGC confirmation.
• USACE National Channel Framework — U.S. Government work — public domain (17 U.S.C. §105) U.S. Army Corps of Engineers (National Channel Framework)
• YachtBazar marina & dock catalog (own projection + researched facts) — YachtBazar own data (catalog + researched marina facts) YachtBazar
• MapLibre GL JS — BSD 3-Clause License MapLibre GL JS (BSD-3-Clause)
• Turf.js (channel-width geometry math, client-side) — MIT License Turf.js (MIT)

Map tiles are a produced work from OpenStreetMap data under the ODbL. Marina & dock records on this map include OpenStreetMap-derived data under the ODbL — machine-readable copy.

Overhead cables are NOT shown in this version. Charted power and communication cables crossing the water are not included in any clearance verdict on this map — check an official chart before transiting under one.

This map publishes OpenStreetMap-derived DATA (OpenStreetMap-derived marina/dock records inside the map pins) under the ODbL, not just rendered tiles — share-alike applies to that file. Machine-readable copy: https://github.com/goldexchangev-hash/yachtbazar-data/releases/tag/v1

USACE IENC: public-domain status is UNCONFIRMED — the service copyright line names production contractor IIC Technologies and no use restriction is stated. Treated as unconfirmed pending USACE/AGC confirmation.

For planning purposes only — not for navigation. Depths, clearances and widths are derived from NOAA, USACE and FHWA data that may be outdated or incomplete (FHWA warns NBI must not be used for route clearance; bridge inspections run on 24-month cycles; some NOAA depths predate 1940 surveys). Verify with official charts, the USCG Local Notice to Mariners, and the bridge tender on VHF.