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Version 20.0

Tidal Currents Module

maj: 09-02-2020
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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 currents are dependent on the SnTides water height module based on the Shomar calculation engine of the SHOM. SnTides is included in the base module. Since Shomar's forecasts are limited to two years, it is alternatively possible to use the external program WXTides for water height.

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, Her Majesty’s Stationery Office
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 by the ScanNav server, and updated twice a day.
The Grib files can be downloaded directly using an http protocol, or by email requests. They are compressed so as to limit download times.
This service is free of charge, but you must first register . Click here to access the registration form.

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):
  • High Resolution 1.5km
  • Forecasts up to 6 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 1/16°
  • Forecasts up to 5 days by 1 hour step
  • Integrates tidal currents and wind effects.
  • Includes the Stokes Drift as an additional layer
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.

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