SHOM Raster GeoTIFF Marine Charts – Gulfs of Suez, Aden, Persian Gulf, Gulf of Oman, Red Sea and Arabian Sea

Introduction

SHOM raster GeoTIFF marine charts covering the Gulfs of Suez, Aden, the Persian Gulf and Gulf of Oman, as well as the Red Sea and Arabian Sea, are georeferenced digital charts designed for navigation, route planning and the study of maritime areas covered by the relevant chart references. They provide, in a compatible digital environment, a raster representation of marine cartography together with the geographical information required for accurate positioning.

This geographical coverage is particularly relevant to navigation between the Mediterranean, Red Sea, Indian Ocean and Persian Gulf. It is of interest to navigators planning a passage through the Suez Canal, navigation in the Red Sea, a route through the Gulf of Aden, or a passage towards the Gulf of Oman, Arabian Sea and Indian Ocean.

The GeoTIFF format combines a cartographic image with georeferencing information. It therefore makes it possible to use a SHOM raster marine chart in navigation or charting software that supports this format.

What is a SHOM raster GeoTIFF marine chart?

A raster GeoTIFF marine chart is a digital representation of a marine chart in the form of a georeferenced image. The raster reproduces the graphical representation of the chart, including coastlines, soundings, depths, depth contours, buoyage, lights, wrecks, hazards, shoals and other hydrographic information shown on the relevant chart.

The term GeoTIFF is important. A standard TIFF file is essentially an image, whereas a GeoTIFF file also contains information allowing the software to determine the precise geographical position of that image.

This characteristic makes the format particularly useful for digital navigation and route planning.

A SHOM GeoTIFF chart can therefore be used as a chart background in a compatible digital environment, subject to the specifications of the file and the capabilities of the software being used.

What area does this SHOM cartography cover?

This category includes raster GeoTIFF digital marine charts covering a large strategic area between the Mediterranean, Red Sea and Indian Ocean.

The areas concerned may include:

• the Gulf of Suez;

• the Red Sea;

• the Gulf of Aden;

• the Arabian Sea;

• the Gulf of Oman;

• the Persian Gulf;

• approaches to these different maritime areas.

This region is particularly important for commercial, professional and long-distance recreational navigation.

It lies along one of the major maritime routes connecting Europe with Asia and the Indian Ocean.

For navigation purposes, however, it is essential to check the exact SHOM chart reference, its scale and its geographical coverage. A chart covering a large area does not necessarily provide the level of detail required for coastal or harbour approaches.

SHOM digital marine chart for the Red Sea

The Red Sea is a particular navigation area because of its geographical configuration and its numerous shoals, reefs, islands and relatively narrow passages.

A SHOM raster GeoTIFF digital marine chart can be used to study the cartographic configuration of the region and prepare a route according to the area covered by the relevant SHOM reference.

The chart can be used to analyse:

• coastline configuration;

• depths;

• navigational hazards;

• shoals;

• islands and reefs;

• buoyage;

• access to ports and anchorages where the chart scale is appropriate.

For a complete Red Sea passage, several scales may be required in order to move from a general overview of the route to more detailed coastal charting.

GeoTIFF marine chart of the Gulf of Suez

The Gulf of Suez forms the southern approach to the Suez Canal and is an especially important maritime area for vessels travelling between the Mediterranean and Red Sea.

A raster GeoTIFF marine chart can be used to prepare an approach to this area and study the main cartographic features represented on the relevant SHOM chart.

For navigation in or near the Suez Canal, however, the marine chart should not be considered in isolation. Navigation rules, regulatory information, local conditions and the documentation required for navigation must also be taken into account.

Digital marine chart of the Gulf of Aden

The Gulf of Aden connects the Red Sea with the Arabian Sea. It is therefore an essential area for maritime routes between the Suez Canal and the Indian Ocean.

A SHOM GeoTIFF marine chart of the Gulf of Aden can be used to study this large maritime area and prepare a route appropriate to the available chart coverage.

For offshore navigation, a small-scale chart may be used to analyse the overall route. As the vessel approaches coastlines, ports or areas presenting particular hazards, larger-scale charts become necessary.

Digital cartography should also be used together with up-to-date nautical and meteorological information.

SHOM digital marine chart of the Gulf of Oman and Arabian Sea

The Gulf of Oman forms the transition between the Persian Gulf and the Arabian Sea. This region may be used for international, commercial or long-distance navigation.

The Arabian Sea, which is much larger, forms an important part of the western Indian Ocean.

A raster GeoTIFF marine chart makes it possible to work with a georeferenced digital representation of the area covered. It can be used, for example, to prepare a route between the Red Sea, Gulf of Aden, India, Sri Lanka or other Indian Ocean destinations, depending on the available chart references.

Persian Gulf marine chart in GeoTIFF format

The Persian Gulf is a complex maritime area characterised by numerous coastal areas, ports, channels, shoals and offshore infrastructure.

For navigation in this region, choosing the correct scale is particularly important. A general chart makes it possible to understand the overall configuration of the Gulf, while a larger-scale chart is required for detailed work in a coastal area or harbour approach.

A SHOM raster GeoTIFF chart can be integrated into compatible software to display the cartography in a digital, georeferenced environment.

What is a SHOM GeoTIFF chart used for in this region?

A GeoTIFF digital marine chart can be used at different stages of navigation planning:

• general maritime route planning;

• study of a navigation area;

• passage planning;

• analysis of charted depths and hazards;

• coastal navigation planning;

• harbour approach planning when the scale is appropriate;

• integration into compatible charting software;

• display of georeferenced raster cartography;

• planning navigation between the Mediterranean and Indian Ocean.

The raster format also has the advantage of preserving the graphical presentation of the original chart, which can make it easier to read for navigators accustomed to paper charts.

SHOM raster chart or vector chart?

Raster and vector represent two different cartographic technologies.

A raster chart is a georeferenced image. It reproduces the graphical appearance of the chart, including its symbols and cartographic information.

A vector chart, by contrast, consists of digital geographical objects. A depth, buoy, wreck or area can be stored as separate objects that can be interpreted by the software.

The choice between raster and vector therefore depends primarily on the software being used, the type of navigation and the available data.

SHOM GeoTIFF is particularly useful when the objective is to have a digital representation that remains faithful to the graphical cartography.

Using a GeoTIFF chart with navigation software

Compatibility of a SHOM GeoTIFF marine chart depends on the software and its version.

Navigation and charting software such as Adrena or ScanNav can work with certain raster formats, but the precise specifications of the software and file should be checked.

Before using a GeoTIFF chart, it is recommended to check:

• accepted file formats;

• coordinate reference system;

• map projection;

• resolution;

• SHOM chart reference;

• scale;

• geographical coverage;

• terms of use and licensing;

• any applicable update conditions.

The fact that software supports the GeoTIFF format does not necessarily mean that it is compatible with every GeoTIFF file.

Example of navigation from the Mediterranean to the Indian Ocean

Consider the example of a sailing yacht leaving the Mediterranean and reaching the Indian Ocean via the Suez Canal.

Cartographic planning may require several levels:

1. general cartography for planning the route;

2. charts covering the Red Sea;

3. cartography appropriate for the Gulf of Aden;

4. charts covering the Arabian Sea and Gulf of Oman;

5. larger-scale charts for coastal and harbour approaches.

The SHOM raster GeoTIFF chart then becomes a digital planning and visualisation tool, to be used together with the other nautical information required.

Criteria to check before choosing a SHOM GeoTIFF chart

To choose a digital marine chart suitable for the Gulfs of Suez, Aden, Persian Gulf and Oman, as well as the Red Sea and Arabian Sea, several criteria should be checked:

• exact navigation area;

• SHOM chart reference;

• chart scale;

• resolution;

• coordinate reference system;

• navigation software being used;

• GeoTIFF compatibility;

• required level of detail;

• terms of use;

• information relating to updates where applicable.

These criteria help avoid selecting a chart that is too general for coastal navigation or, conversely, one that is unsuitable for offshore route planning.

Cartography suitable for long-distance navigation

The Gulfs of Suez, Aden, Persian Gulf and Oman, together with the Red Sea and Arabian Sea, lie at the heart of several major international maritime routes.

For navigators planning a long passage, GeoTIFF digital cartography makes it possible to work with different geographical areas from a compatible computer environment.

It may be particularly relevant for:

• a Red Sea crossing;

• route planning between Suez and the Indian Ocean;

• route planning in the Gulf of Aden;

• navigation in the Arabian Sea;

• navigation in the Gulf of Oman;

• cartographic study of the Persian Gulf;

• world cruising preparation.

Conclusion

SHOM raster GeoTIFF marine charts covering the Gulfs of Suez, Aden, Persian Gulf and Oman, as well as the Red Sea and Arabian Sea, meet the needs of navigators looking for georeferenced digital cartography to prepare and study maritime routes in this extensive region.

The GeoTIFF format combines the raster graphical representation of the chart with the geographical information required to position it within compatible software. It therefore makes it possible to retain a reading experience close to traditional cartography while working in a digital environment.

When selecting the appropriate SHOM GeoTIFF marine chart, the key factors remain the chart reference, geographical coverage, scale, level of detail, software used and terms of use.

As with all marine cartography, a digital chart should be used together with up-to-date nautical information, weather data, tides, currents, Notices to Mariners and all other information required for navigation planning and execution.

FAQ – SHOM Raster GeoTIFF Marine Charts – Red Sea, Gulf of Aden, Persian Gulf and Arabian Sea

What is a SHOM raster GeoTIFF marine chart of the Red Sea?

It is a georeferenced digital marine chart reproducing SHOM cartography for an area of the Red Sea in raster format. The GeoTIFF format contains the information required to correctly position the image in compatible software.

Which SHOM GeoTIFF marine chart should I use for the Gulf of Aden?

The choice depends on the exact area to be covered and the required scale. The SHOM chart reference, geographical coverage and compatibility with the navigation software being used should be checked.

Are SHOM GeoTIFF charts available for the Persian Gulf?

Certain SHOM chart references cover areas corresponding to the Persian Gulf and neighbouring maritime regions. Exact coverage should be checked for each reference.

Does a GeoTIFF chart cover the entire Red Sea?

This depends on the chart reference. A small-scale chart may cover a large area, but several references may be required to obtain an appropriate level of detail throughout a complete voyage.

Can a SHOM GeoTIFF chart be used to plan a passage through the Red Sea?

Yes, a compatible GeoTIFF chart can be used to plan and visualise a route. It should be supplemented with the nautical, meteorological and regulatory information required for navigation.

What is the difference between a SHOM raster GeoTIFF chart and a vector chart?

A raster chart is a georeferenced image reproducing the graphical representation of the chart. A vector chart consists of digital geographical objects interpreted by the software.

Is the GeoTIFF format compatible with Adrena?

Adrena can support certain raster files, but exact compatibility depends on the file, its structure and the software version. The relevant specifications should therefore be checked.

Is the GeoTIFF format compatible with ScanNav?

ScanNav can use certain georeferenced raster data. Compatibility should nevertheless be checked for the specific SHOM chart reference and GeoTIFF file concerned.

What scale should I choose for navigation in the Gulf of Aden?

The appropriate scale depends on the purpose. A small scale is suitable for general offshore route planning, while a larger scale is required to study a coastal area or approach in detail.

Is a SHOM GeoTIFF chart sufficient for navigation in the Persian Gulf?

No. The chart is one component of navigation planning. It should be used together with up-to-date nautical information, weather data, tides, currents and relevant regulatory information.

Does a SHOM GeoTIFF marine chart cover the Gulf of Oman and Arabian Sea?

Coverage depends on the available chart references. The exact geographical area covered by each chart should be checked before using it to plan a route between the Gulf of Oman and Arabian Sea.

Can these charts be used for navigation from Suez to the Indian Ocean?

Yes, provided that the relevant references cover the successive navigation areas and that an appropriate scale is used for each stage, particularly for coastal navigation and harbour approaches.