Admiralty Atlantic Ocean Nautical Chart: Charting for Offshore Navigation and Transatlantic Passages

Introduction

The Admiralty Atlantic Ocean nautical chart is designed for planning offshore navigation, transatlantic passages and circumnavigation projects. Published by the United Kingdom Hydrographic Office (UKHO), Admiralty charting provides coverage of vast maritime areas and allows sailors to plan a route before moving on to larger-scale charts for coastal areas.

The Atlantic Ocean stretches between Europe, Africa, North America, South America and Antarctica. It includes very different environments: the North Atlantic, South Atlantic, Caribbean Sea, the Azores, Madeira, Canary Islands, Cape Verde, the West Indies, as well as the American and African coastlines.

An Admiralty chart of the Atlantic Ocean therefore provides an overall view that is essential for planning an ocean passage, organising the different stages of a long-distance voyage or placing a navigation project within the wider context of a circumnavigation.

What is an Admiralty Atlantic Ocean nautical chart used for?

An Admiralty nautical chart covering the Atlantic Ocean is primarily used to plan navigation over long distances. It allows a large maritime area to be viewed at the same time and the main geographical areas along a route to be identified.

It can be used to:

• plan a transatlantic passage;

• visualise a route between Europe and the Caribbean;

• plan a passage between Africa and South America;

• organise a North or South Atlantic crossing;

• identify the main archipelagos and possible stopovers;

• plan the different stages of a circumnavigation;

• determine which areas require larger-scale charts;

• complement route planning carried out using navigation software or a GPS chartplotter.

An ocean chart is therefore primarily a general planning tool. It does not replace the detailed charts required for coastal navigation or harbour approaches.

The Atlantic Ocean: a major maritime area

The Atlantic is one of the world's major navigation areas. It is crossed every day by merchant ships, fishing vessels, cruise ships, cruising yachts and vessels undertaking ocean passages.

For a navigator preparing a long-distance voyage, the Atlantic can be divided into several major areas:

• North Atlantic;

• South Atlantic;

• European coastline;

• African coastline;

• North American coastline;

• South American coastline;

• Caribbean and West Indies;

• Atlantic archipelagos.

An Admiralty Atlantic Ocean nautical chart makes it possible to understand the relative position of these different regions and prepare a general route before working on more detailed areas.

Planning a transatlantic passage

A transatlantic passage generally involves several thousand nautical miles. Its preparation therefore requires a chart covering a sufficiently large area to visualise the entire route.

Take the example of a yacht leaving the Canary Islands for the Caribbean. An Atlantic Ocean chart first makes it possible to visualise the general route, distances and the main archipelagos located on or near the passage.

The navigator can then complement this preparation with passage charts and more detailed documents for:

• approaches to the Canary Islands;

• navigation around Cape Verde if required;

• arrival in the West Indies;

• approaches to individual islands;

• channels, passes and harbours.

The ocean chart remains the document that provides an overall view of the passage.

Admiralty Atlantic chart and offshore navigation

For offshore navigation, charting must allow large distances to be represented effectively while making route planning straightforward.

An Admiralty Atlantic Ocean chart can be used to compare different routes and plan the major stages of a voyage. It also makes it possible to visualise the distances between the main departure and arrival points.

For a passage between Europe and the Caribbean, for example, the navigator can study the entire Atlantic basin before determining which charts are required for the different coastal areas.

The ocean chart should nevertheless be regarded as a general level of charting. As the vessel approaches the coast, a greater level of detail is required.

North Atlantic and South Atlantic

Charting requirements can vary depending on which part of the Atlantic Ocean is concerned.

The North Atlantic includes routes between Europe, North America, the Azores, Bermuda and the Caribbean. Navigation in this region can involve changing weather conditions and significant maritime traffic.

The South Atlantic includes routes between South America, Africa, the islands of the South Atlantic and approaches to the Southern Ocean. Distances between some areas are considerable and require appropriate chart planning.

An Admiralty Atlantic Ocean nautical chart provides an overall representation of these large maritime areas and helps determine the additional documentation required for each sector.

From Europe to the Caribbean: a route-planning example

A typical offshore route may connect Europe with the Caribbean via the Atlantic archipelagos.

The navigator can organise the voyage around several stages:

1. planning the route from the European coast;

2. sailing towards the Canary Islands or another departure point;

3. crossing the Atlantic;

4. approaching the West Indies;

5. coastal and inter-island navigation.

The Admiralty Atlantic Ocean nautical chart makes it possible to visualise the entire route. Larger-scale charts then take over for coastal areas, archipelagos and harbour approaches.

A useful chart for circumnavigation

For a circumnavigation, an Atlantic Ocean chart can be used to plan an essential part of the overall voyage.

It can be used to:

• plan a passage from Europe to the Caribbean;

• prepare a route towards South America;

• organise a northbound Atlantic passage;

• plan a transit through the Panama Canal;

• visualise the main stages of a round-the-world voyage;

• organise the transition between the Atlantic, Pacific and Indian Oceans.

A chart covering a large area therefore makes it possible to place each passage within the wider context of the voyage.

Which scale should be used for navigation in the Atlantic?

The appropriate scale depends on the stage of the voyage.

For planning an ocean passage, a small-scale chart covering a very large area is appropriate for general planning. In cartography, a small-scale chart represents a large area with less detail.

Conversely, a large-scale chart covers a smaller area but provides a much more detailed representation.

Nautical documentation can therefore be organised according to several levels:

• ocean chart for the overall view;

• passage chart for a specific crossing;

• regional chart for a geographical area;

• coastal chart for navigation close to the coast;

• detailed chart for complex areas;

• harbour plan for entering and leaving ports.

This progression in chart scales is essential for adapting chart coverage to the different stages of navigation.

A complement to electronic navigation systems

Navigation software, GPS chartplotters and electronic charting systems are now widely used to plan and monitor routes.

Paper charts nevertheless retain a particular value when preparing offshore navigation. They make it possible to visualise a large area without relying on a screen or electronic system.

They also provide a complementary resource in the event of an electrical power problem, computer failure or unavailability of a digital system.

For a transatlantic passage, combining paper charting with electronic navigation therefore provides complementary representations of the voyage.

Admiralty Atlantic Ocean chart for navigation schools

An Atlantic Ocean chart is also a useful educational resource for teaching navigation.

It can be used to work on:

• planning an ocean passage;

• calculating distances;

• reading coordinates;

• plotting a route;

• using different chart scales;

• representing a large maritime area;

• planning a circumnavigation.

Navigation schools and instructors can therefore use an Admiralty Atlantic chart to teach the principles of long-distance voyage planning.

Who are Admiralty Atlantic Ocean nautical charts intended for?

An Admiralty Atlantic Ocean nautical chart is suitable for a range of navigators:

• recreational sailors preparing a transatlantic passage;

• offshore sailors;

• circumnavigators;

• delivery crews;

• merchant navy professionals;

• navigation schools;

• instructors and maritime training centres;

• sailors preparing a round-the-world voyage.

It is particularly suited to users looking for an overall representation of the Atlantic to plan long-distance navigation.

Planning an Atlantic crossing with appropriate nautical documentation

A transatlantic passage requires several levels of documentation. An Admiralty Atlantic Ocean nautical chart provides the starting point with an overall view of the route.

The navigator must then select charts corresponding to the different areas of the voyage. Departure and arrival areas, archipelagos, coastal approaches and harbours generally require larger-scale documents.

This approach avoids expecting a single chart to provide both a view covering several thousand nautical miles and the level of detail required for coastal navigation.

Why use an Admiralty nautical chart for the Atlantic?

Admiralty charting is published by the United Kingdom Hydrographic Office (UKHO), a leading British hydrographic organisation. Admiralty charts are used in many professional and maritime navigation contexts.

For the Atlantic, they provide charting suitable for planning major ocean routes and organising the documentation required for the different stages of a voyage.

The Admiralty Atlantic Ocean nautical chart therefore has an important role in preparing transatlantic passages, offshore navigation and circumnavigation projects.

Conclusion

The Admiralty Atlantic Ocean nautical chart is a cartographic resource designed for planning ocean passages, offshore navigation and circumnavigation projects. It provides an overview of a vast maritime area and allows a general route to be planned before moving on to larger-scale charts.

For a passage between Europe and the Caribbean, navigation in the North or South Atlantic, or a round-the-world voyage, it helps structure chart planning and identify the documentation required for the different stages.

Used alongside passage charts, coastal charts, detailed charts and electronic navigation systems, it provides an effective tool for planning long-distance navigation across the Atlantic Ocean.

FAQ – Admiralty Atlantic Ocean Nautical Chart

What is an Admiralty Atlantic Ocean nautical chart used for?

It is primarily used to plan offshore navigation, transatlantic passages and circumnavigation projects by providing an overall view of the Atlantic basin.

Which chart should be used for an Atlantic crossing?

An ocean chart is used for general route planning. It should then be complemented by passage, regional, coastal and detailed charts depending on the areas crossed.

Is an Admiralty Atlantic chart suitable for a Europe–Caribbean passage?

Yes. It makes it possible to visualise the general route between Europe and the Caribbean. Departure and arrival areas and the archipelagos along the route should then be studied using larger-scale charts.

Is an Atlantic Ocean chart useful for a circumnavigation?

Yes. It helps plan the major stages of a circumnavigation across the Atlantic and place ocean passages within the wider context of a round-the-world voyage.

What is the difference between an ocean chart and a coastal chart?

An ocean chart covers a very large area with a limited level of detail. A coastal chart covers a smaller area but provides more information required for navigation close to the coast.

Can a paper chart be used with a GPS chartplotter?

Yes. Paper charts and GPS chartplotters can be used as complementary resources for planning and monitoring navigation.

Does an Admiralty Atlantic chart cover the Caribbean?

Depending on the chart and its geographical coverage, some charts may include part of the Caribbean. Detailed navigation in the West Indies requires specific larger-scale charts.

Which areas can be planned with an Admiralty Atlantic nautical chart?

Depending on the chart concerned, planning may include the North Atlantic, South Atlantic, European, African and American coastlines, as well as the main Atlantic archipelagos.

What documentation is required for a transatlantic passage?

A passage generally requires several levels of charting: ocean charts for general planning, passage charts for the crossing, followed by regional, coastal and detailed charts for approaches and complex navigation areas.