Electronic navigation systems such as GPS, Electronic Chart Displays (ECDIS) and Automatic Identification Systems (AIS) provide great assistance to mariners and significantly contribute to navigational safety. Voyage Data Recorders (VDR) were specifically designed to collect data from these electronic navigation systems and other onboard sensors for use in accident investigation. These systems provide investigators with a wealth of data about a vessel’s movements and status in the moments leading up to an accident.