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UKHO answering questions

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S-100: your questions answered

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Across recent UKHO webinars and industry events, several questions have appeared repeatedly. Here, we address some of the most common and look at what mariners and operators need to know at this stage of the transition.

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  • Insight
  • S-100
ADSD on the bridge

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Reducing friction in passage planning

Article description

Efficient passage planning depends on bringing together trusted information from multiple sources. As the volume of information available to bridge teams grows, the challenge is increasingly about finding what matters and understanding it efficiently. We explore how reducing unnecessary friction can give navigators more time to focus on the decisions that support safe navigation.

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  • Insight
  • ADMIRALTY products and services
Safety contour

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Understanding ECDIS: Beyond the default 30m safety contour

Article description

Setting the ECDIS safety contour correctly is one of the most effective things a bridge team can do to prevent grounding. When configured for the vessel's actual draught, margins and operating conditions, it controls how depth information is displayed in ECDIS and alerts the crew before the vessel approaches unsafe water.

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  • Insight
  • ADMIRALTY products and services
port simulation

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Four ports, one emerging global view of S-100

Article description

Could having more maritime data actually reduce the amount of interpretation required on the bridge? In this multimedia feature article, pilots, mariners and hydrographic offices reflect on evaluating trial S-100 data sets across four challenging port environments, revealing a consistent view of how richer maritime data could support more efficient navigational decision-making.

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  • Insight
  • S-100
ECDIS alert

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Understanding ECDIS alerts: How to reduce alarm fatigue

Article description

For most navigators, the sound of an ECDIS alert is unmistakable. Depending on the watch, an ECDIS alert can mean anything from a routine chart update to an imminent grounding risk. The challenge is knowing which is which – and acting accordingly.

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  • Insight
  • ADMIRALTY products and services
Greece trials stakeholders

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S-100 tested by experienced commercial mariners in Greece

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Simulator trials conducted with commercial mariners from leading tanker, LNG and bulk fleets have provided new insight into how S-100 performs in practice, highlighting improvements in clarity, decision-making and planning — alongside the need for careful implementation and training.

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  • News
  • S-100
CSMART simulator trials

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S-100 in confined waters: Port of Southampton

Article description

In March 2026, the UK Hydrographic Office (the UKHO) joined global partners at the Center for Simulator Maritime Training (CSMART) to test how S-100 data performs in realistic navigation scenarios.

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  • Insight
  • S-100
Simulator learning

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ECDIS Ltd S-100 simulator trial

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In February 2026, the UK Hydrographic Office (UKHO) brought S-100 data into a live training environment at ECDIS Ltd, working alongside industry partners to explore how the next generation of hydrographic data performs in realistic navigation scenarios.

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  • Insight
  • S-100