AtoBviaC Ltd is a United Kingdom based company providing marine distances to all sectors of the maritime industry that are involved in the control of sea-going ships.

We provide a range of products and services to meet our customers' needs and are willing to discuss any topic relating to distances or ships' routes which will help customers or enhance our products.

Our new PortToPort Online application is now live!

We are excited to launch our new web application.
PortToPort Online has an improved user interface and will work on any modern web browser.
Please email comments and feedback to

Access PortToPort Online >>>
The legacy application will be retired at the end of August 2018

We need to retire the legacy PortToPort Online application as it relies on an old technology (Microsoft Silverlight).
This application only runs on on Internet Explorer (on Windows) or Safari (on Mac).

The Marine Distance Tables

The AtoBviaC Marine Distance Tables have a long history of being the definitive distance provider to the shipping industry. They continue to be the standard for marine distance calculations.

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Accurate Distances

All distances are based on a contemporary network of routes maintained on a weekly basis by AtoBviaC using Admiralty Notices to Mariners. The criteria for selecting all routes can be viewed on this website.

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AtoBviaC offer a range of products which provide customers with distance and routing information depending on their needs. Cost effective solutions are available Online and on Windows PCs.

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