AtoBviaC Web Service

Our PortToPort software applications are powered by a “Distance Table Engine” which is available to developers via a Web Service. This allows companies to integrate the Distance Tables into their own in-house applications to provide access to distances, display maps and plot routes according to their own requirements.

The Web Service gives the developer the ability to calculate distances between ports whilst specifically requesting the shortest route or a route via the most commonly used routing points and if required total control over all the 185 or so routing points within the Distance Tables. In addition, the ability to scan the resulting route and obtain an analysis of distances to and within Emission Control Areas is included.

With the use of the optional add-on functionality the developer has access to a highly configurable map displaying the route used and to a detailed list of the waypoints enabling the plotting of the route on any chosen map display and with the ability to get access to the distance to any waypoint and thereby calculate the ETA to any relevant location passed en-route.

The full web service documentation is available to view here.

New AtoBviaC Web Service Now Released

The new AtoBviaC Web Service is now released and available for commercial use.

Billing is now enabled - distances will be deducted from your account when calling the web service with your Access Key.

Your existing Access Key can be used to authenticate with the service.

This new web service has been developed as part of AtoBviaC’s continued efforts to improve our services. It uses modern web technologies and provides an improved API to make it easier to develop against. The new web service will also allow us to enhance the web service with additional capabilities in the future.

The web service can be accessed here:

Important Information About the Legacy Web Service

The legacy web service will be retired later this year. The earliest this will happen is June 2017. We encourage you to begin preparations to migrate to the new web service now. We would be delighted to hear from you with any questions or feedback you might have. Please contact

The legacy web service documentation is available to view here.


Pricing is based on an annual subscription model; users purchase a block of distance calculations that are valid for up to one year, similar to PortToPort Online.

The following optional functionality is available at an additional annual charge:

  • Mapping
  • Routing: Waypoint spacing >= 50 Nm intervals
  • Routing: Waypoint spacing >= 1 Nm intervals

For full details see the Online Store page.