As part of the emerging S-100 data framework being introduced by the International Hydrographic Organization (IHO), a range of new product specifications are under development to enhance the way maritime data is shared, displayed and used. 

This includes new specifications for water levels information (S-104) and surface currents (S-111), which will bring together dynamic tidal information for use in a wide range of decision making from ship to shore. These data sets will be fully interoperable for use with other product specifications in the S-100 data framework, meaning they can be displayed on the next generation of S-101 Electronic Navigational Charts.

What is S-104?

S-104 is the new standard for water level information for surface navigation, helping users understand the changes in water levels for dynamic tidal applications. 

When used alongside bathymetric surface data of the seafloor (S-102), this water levels information could underpin dynamic under keel clearance calculations based on the changing tides. This would allow the user’s safety contour in ECDIS to adjust automatically, providing greater confidence of the depth of water underneath the keel and potentially opening up more navigable space in shallow waterways and port approaches.

What is S-111?

S-111 is the product specification for tidal surface currents, providing information on both surface current speed and surface current direction. 

Surface currents data could play a role in supporting more optimised and efficient voyages. For example, by using near-real-time information on surface currents, vessels could adjust their engine speeds to reduce unnecessary fuel burn and, crucially, the associated emissions.

Putting S-104 and S-111 to the test

S-100-enabled tidal models could offer more precise, granular tidal data with dynamic adjustments, allowing for improved decision making within the port environment. Such tidal models are currently being developed and tested by hydrographic offices around the globe to help understand the value of S-100 in supporting navigational efficiencies and port operations. 

Recently, the UK Hydrographic Office (UKHO) collaborated with the Port of London Authority (PLA) to test the applications of S-104 and S-111 as part of a sea trial within one of the UK's busiest ports. Watch our video to find out more about the learnings from representatives from the UKHO and PLA.

The UK Hydrographic Office (UKHO) collaborated with the Port of London Authority (PLA) to test the applications of S-104 and S-111.