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Tidal Currents Module

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The Tidal Currents module of ScanNav allows you to overlay the currents to your charts, in real time, or at any selected day and time. You can plan your navigation according to these, either manually, or in conjunction with the new Routing module, available from version 17 of ScanNav (release planned for the Paris 2016 show). It also provides access to the Currents Grib file download service based on data issued from Mercator / MyOcean.

The calculation of currents is dependent on the SnTides water height module which is included in the base module.

The currents source data are issued either from the SHOM UJA data, the UKHO data, or GRIB files download service.

SHOM Logo
SHOM Data: © SHOM 2005 - Reproduced with the permission of the
Service Hydrographique et Océanographique de la Marine - France –
Contrat n° 30/2005 - www.shom.fr
Click on the zones numbers for details of each area
557-UJA 563-UJA 560-UJA 558-UJA UJA-559 565-UJA 564-UJA 562-UJA 561-UJA


Currents data issued from SHOM data (reproduction authorization No. 30/2005) are the equivalent of the UJA paper Atlas, with the same breakdown (9 Atlas). They cover the Channel and Atlantic coasts of France.

The atlases can be purchased individually, or in packs, via the order form.

Unlike Grib files, the data is preinstalled with ScanNav, and does not require any additional download.

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Each current zone corresponds to a paper Atlas of SHOM. Click on the zone number in the map opposite, or in the list below for details on each area

Click on the zones numbers for details of each area
Designation Edition Price
UJA557 Pas de Calais 1988 40
UJA558 Côte Sud Bretagne d'Audierne au Croisic 2005 40
UJA559 Côte Ouest Saint-Nazaire à Royan 2001 40
UJA560 Côte Ouest Bretagne Goulven à Penmarc'h 1994 40
UJA561 Baie de Seine, de Cherbourg à Fécamp 1996 40
UJA562 Golfe Normand - Breton, de Cherbourg à Paimpol 1998 40
UJA563 Côte Nord de Bretagne, des Héaux-de-Bréhat à la Pointe de Pontusval 1999 40
UJA564 La Manche, de Dunkerque à Brest 2000 40
UJA565 Golfe de Gascogne 2002 40
UKHO Data: © British Crown Copyright 2011 - All rights reserved
This product has been derived in part from material obtained from the UK Hydrographic Office with the permission of the UK Hydrographic Office, the Keeper of Public Records.
http://www.ukho.gov.uk
Designation Edition Price
UKHO1500 Royaume Uni, Belgique, Pays-Bas, Mer du Nord, Points éparses Iceland, Gibraltar, Portugal 2011 20
Currents GRIB file service:
data issued from Mercator/MyOcean
http://marine.copernicus.eu/

ScanNav hosts a GRIB download service with Currents data issued from Mercator - MyOcean. These data are transformed into Grib files by the ScanNav server, and updated several times per day.
The Grib files can be downloaded directly using the http protocol, or by email requests. They are compressed so as to limit download times.

This service is included free of charge with the Currents module, but you must first register to create an account. Click here to access the registration form. This account is common with the weather Gribs download service.

The list of available models changes regularly, and independently of the versions of ScanNav. Remember to update your models! (see documentation)


The models used to generate the Grib files are the following:
IBI Model (Iberian Irish Biscay):
  • Resolution 1/36°
  • Forecasts up to 5 days by 1 hour step
  • Integrates tidal currents and wind effects.
For more information please refer to the model description on the Copernicus web site
couverture IBI
NWS Model (European North Western Shelf):
  • Resolution 1/36°
  • Forecasts up to 5 days by 1 hour step
  • Integrates tidal currents and wind effects.
For more information please refer to the model description on the Copernicus web site
couverture NWS
Mediterranean Model:
  • Resolution 1/24°
  • Forecasts up to 10 days by 1 hour step
  • Integrates tidal currents and wind effects.
For more information please refer to the model description on the Copernicus web site
Modèle MED
New model available from version 21.2 Global Worldwide Model:
  • Resolution 1/12°
  • World wide coverage
  • Forecasts up to 10 days by 1 hour step
  • Integrates tidal currents, wind effects, and Ocean Streams.
For more information please refer to the model description on the Copernicus web site
Modèle MED
You also have access to the Ocean currents Grib files from the RTOFS model of Noaa with global coverage at a resolution of 1/12° giving forecasts up to 8 days in steps of 3 hours. The model can be downloaded by email via SailDocs.

ScanNav is also compatible with other sources of Currents in Grib format available on the net. For example the German BSH provides Currents data for the following areas:

  • North Sea             48.5°N/004.0°W to 60.0°N/010.0°E, grid 6 nm, 1 h
  • German Bight       53.3°N/007.5°E to 54.5°N/009.3°E, grid 1 nm, 5 h
  • Baltic Sea             52.0°N/010.0°E to 68.8°N/030.0°E, grid 6 nm, 1 h
  • Western Baltic      53.2°N/009.5°E to 56.4°N/014.8°E, grid 1 nm, 1 h

As an example, to obtain GRIB Currents data for North Sea and Chanel Sea:

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