# About DDT

The **Dataloy Distance Table** allows port and routing point searches when building sailing routes and is available to both commercial and non-commercial users. It supports **alternative spelling** and **shortening** of port names as well as usage of each routing point's **unique code**. Sailing routes are presented graphically in a map and based on analysis of possible routing options.

![](https://1956582762-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Liw6C9Fe7rohFtkU25j%2F-M3Ktrn6qF2qTRQzvQv_%2F-M3KueCMUk63vw4EitJZ%2FScreenshot%202020-03-26%20at%2009.16.55.png?alt=media\&token=2762b71c-d83f-4511-9852-3f55a7b57e67)

{% hint style="info" %}
The graphical presentation of the sailing route is only available on bigger screens like pc, laptop or tablet. You can use your mobile device to calculate the distances but the sailing route will not be displayed on a map on these devices.  
{% endhint %}

* The **DDT** is highly acclaimed for its extensiveness and accuracy.
* Currently the **DDT** holds more than **10,000** ports and maritime locations and more than **90,000** waypoints effectively contributing to the accuracy of a calculation.  

![The number of waypoints is vital to the accuracy of voyage calculation.](https://1956582762-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Liw6C9Fe7rohFtkU25j%2F-M3KtB909T4yHzCnDtwP%2F-M3KtdoVXu62N4WNK94-%2FScreenshot%202020-03-26%20at%2009.12.08.png?alt=media\&token=0f923477-3eae-4a83-8005-85dbc3e274fd)

* The **DDT** also enables routing based on minimising sailing in **Emission Controlled Areas** **(ECA)**.
* There are **war risk** and **anti-piracy** routing points available in high risk areas. 
* Updated daily.

{% hint style="warning" %}
**Irregular** **Routing or Missing Ports or Routing Points**

If irregular routing is experienced, for example the sailing route crossing land, etc. - *please* [***contact Dataloy***](mailto:ddt@dataloy.com).

Ports and routing points are constantly added to the DDT. If a port or a routing point cannot be found - *please* [***contact Dataloy***](mailto:ddt@dataloy.com) *for it to be added*.
{% endhint %}