## Purpose

The **Voyage Data Recorder (VDR)** is designed to record all circumstances of the voyage, including data from ECDIS. The VDR automatically records navigational data, system status, and other parameters necessary for analysis of events that occurred on board the vessel.

ECDIS transmits data to the VDR at a specified interval. Data transmission intervals are {doc}`configured </sections/sensors/vdr/vdr-setup/index>` separately for the active and backup ECDIS.

ECDIS treats the VDR as a sensor.

Only one VDR can be created in ECDIS (system requirement).

![VDR addition interface](images/image518.png)
