Data attributions

US National Oceanic and Atmospheric Administration, National Centers for Environmental Prediction. Produced by a US Government agency and in the public domain. NOAA does not endorse this site and is not responsible for anything derived from the data.

European Centre for Medium-Range Weather Forecasts. This data and the products derived from it here are based on data and products of the European Centre for Medium-Range Weather Forecasts (ECMWF). Licensed under CC BY 4.0 and the ECMWF Terms of Use. ECMWF does not accept liability for any error or omission in the data, for its availability, or for any loss or damage arising from its use. Forecasts shown here are modified from the ECMWF open data release by extraction to a route corridor and recompression.

The reanalysis this site scores its own past forecasts against, read from the ARCO-ERA5 mirror of the Copernicus Climate Data Store. Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Modified here by extraction to a route corridor, resampling of the latitude axis, and recompression.

Global ocean bathymetry at 15 arc-second resolution. Cited as: GEBCO Compilation Group (2024) GEBCO 2024 Grid (doi:10.5285/1c44ce99-0a0d-5f4f-e063-7086abc0ea0f).

Per-lake grids at roughly 3 arc-seconds. GEBCO models the Great Lakes as land elevation, so lake depth comes entirely from this source.

Electronic Navigational Chart Approach, Harbour and Berthing feature services, used for inshore depth contours. These are chart products reprocessed for planning; they are not a substitute for official charts and carry no navigational warranty here.

The independent global routing shoreline is derived from OpenStreetMap natural=coastline through the land-polygons service at osmdata.openstreetmap.de; OpenStreetMap also underlies the base map. © OpenStreetMap contributors, available under the Open Database Licence.

The base map style and vector tiles the chart is drawn from, built on OpenStreetMap data.

Tidal current predictions are computed by RegattaPages from the ADCIRC regional tidal constituent databases EC2015 (Western North Atlantic, Caribbean and Gulf of Mexico) and ENPAC15 (Eastern North Pacific), obtained from the ADCIRC website. These databases were developed at the University of Oklahoma with support from the National Oceanic and Atmospheric Administration (EC2015) and the U.S. Army Corps of Engineers Institute of Water Resources and Engineer Research and Development Center (ENPAC15). The predictions presented here are derived, interpolated products computed by RegattaPages. They are not official NOAA, USACE, or ADCIRC products, and RegattaPages is not affiliated with, operated by, or endorsed by NOAA, the U.S. Army Corps of Engineers, the University of Oklahoma, or the ADCIRC development team. The database authors and the U.S. Army Corps of Engineers assume no responsibility for their accuracy. Of the 37 harmonic constituents the databases carry, eight have been validated by the authors; the nonlinearly generated constituents are used with the caution the authors advise. Not for navigation. Cited as: Szpilka, C.; Dresback, K.; Kolar, R.; Feyen, J.; Wang, J. Improvements for the Western North Atlantic, Caribbean and Gulf of Mexico ADCIRC Tidal Database (EC2015). J. Mar. Sci. Eng. 2016, 4(4), 72 (doi:10.3390/jmse4040072); and Szpilka, C.; Dresback, K.; Kolar, R.; Massey, T.C. Improvements for the Eastern North Pacific ADCIRC Tidal Database (ENPAC15). J. Mar. Sci. Eng. 2018, 6(4), 131 (doi:10.3390/jmse6040131).

Coastal and Great Lakes current forecasts (LMHOFS, CBOFS, SFBOFS and the other OFS models) from the NOAA National Ocean Service, read from the NOAA Open Data Dissemination program. Produced by a US Government agency and in the public domain; NOAA does not endorse this site.

UTC astronomical arguments and nodal corrections for harmonic synthesis. MIT License, © 2017 Tyler C. Sutterley. Permission is hereby granted, free of charge, to any person obtaining a copy of this software, to deal in the Software without restriction; the software is provided “as is”, without warranty of any kind.

ORC certificates and the VPP polars derived from them. Certificate data is used for performance modelling; ORC does not endorse this site, and a route computed here has no standing under any rating rule.

The map renderer, under the 3-Clause BSD licence.

The single-file tile archive format the chart and bathymetry are served from, under the BSD-3-Clause licence.