Data Sources & Attribution
NaviSight is built on public meteorological, oceanographic and hydrographic data. This page lists those sources and the attributions their licences require. It describes where the data comes from, not how it is processed.
Required licence notices
Contains modified Copernicus Climate Change Service information 2026.
Neither the European Commission nor ECMWF is responsible for any use of this information. NaviSight derives products from ERA5 reanalysis data obtained through the Copernicus Climate Data Store.
GEBCO Compilation Group (2024) GEBCO 2024 Grid.
Bathymetry shown on the chart and used for depth gating is derived from the GEBCO 2024 global terrain model.
© OpenStreetMap contributors — data available under the Open Database Licence (ODbL).
Coastline geometry used for the land mask, and the basemap tiles, derive from OpenStreetMap.
ECMWF Open Data — CC BY 4.0.
Basemap tiles © CARTO and MapTiler. Seamarks © OpenSeaMap contributors. Satellite imagery © Esri.
Forecast and reanalysis models
| Model | Provider | Used for | Resolution | Update | Horizon |
| GFS | NOAA / NCEP | Surface wind, temperature, pressure, visibility | 0.25° | 4×/day (00/06/12/18 UTC) | 16 days |
| GEFS | NOAA / NCEP | 31-member ensemble spread for forecast uncertainty | 0.25° | 4×/day | 5 days |
| WAVEWATCH III | NOAA / NCEP | Significant wave height, period, direction, swell partitions | 0.16° | 4×/day | 10 days |
| IFS (Open Data) | ECMWF | Surface wind, temperature, pressure | 0.25° | 4×/day | 10 days (15 via ensemble control) |
| ICON | Deutscher Wetterdienst (DWD) | Surface wind, temperature, pressure | ~13 km, regridded to 0.25° | 4×/day | 7.5 days |
| ESPC-D / HYCOM | US Navy / NRL | Surface currents, sea-surface temperature, ice | 1/12° | Daily | 7 days |
| ERA5 | Copernicus Climate Change Service (C3S) / ECMWF | Historical reanalysis — climatology, route availability, past-voyage analysis | 0.25°, hourly | Reanalysis (~5-day latency) | 1940–present |
Forecast horizons are the maximum each model publishes. Available range in the application depends on the most recent cycle successfully retrieved, which is shown on the chart with the forecast time.
Geospatial and navigational data
| Dataset | Provider | Used for | Detail |
| GEBCO 2024 Grid | GEBCO Compilation Group | Bathymetry — depth gating, under-keel clearance, shallow-water wave transformation | 15 arc-second (~463 m) |
| OpenStreetMap coastline | OpenStreetMap contributors | Land mask for route generation | 0.0025° (~278 m) |
| NOAA NCEI Great Lakes bathymetry | NOAA NCEI | Depth in the Great Lakes, which marine bathymetry products do not cover | 3 arc-second, resampled to ~550 m |
| World Port Index | NGA Maritime Safety Information | Charted entrance-channel depths for port approaches | 2,951 ports |
| Electronic Navigational Charts (ENC) | NOAA Office of Coast Survey | Shoreline, aids to navigation, regulated areas | S-57 vector charts, US waters |
| Notices to Mariners | USCG, NGA, NOAA | Active navigational warnings | Refreshed weekly |
| AIS vessel positions | NOAA Marine Cadastre | Historical vessel tracks for exposure analysis | US waters, public release (~6-month latency) |
NOAA, NGA, USCG and US Navy products are works of the United States federal government and are in the public domain. They are credited here for transparency rather than by obligation.
Scoring inputs
NaviSight measures environmental exposure — the weather and sea conditions a vessel is forecast to encounter, or did encounter. It does not predict loss.
No insurance claims data is used anywhere in the platform, and no scoring output is derived from claims records. Vessel exposure scores and the comparative fleet analytics built on them are computed from AIS positions and reanalysis weather alone.
The navigation hazard score shown alongside route planning additionally uses published marine casualty statistics from the NTSB, UK MAIB and USCG to calibrate condition-severity curves. Those are public safety records, not claims or policy data. Work is in progress to separate this calibration from the scoring path entirely, so that all scores are computed independently of incident records and incident data is used only for after-the-fact validation.
Navigation disclaimer
NaviSight is a planning aid and is not a navigation system. It is not approved for navigation, does not replace official nautical charts or Notices to Mariners, and must not be used as the sole basis for any navigational decision. Forecast weather is uncertain and degrades with lead time. The master of the vessel remains solely responsible for the safety of the vessel, crew, passengers and cargo, and for compliance with COLREGs and all applicable regulations.
Last reviewed 2026. Questions about data sourcing or licensing: contact NaviSight.