Not exactly an expert on VDR systems but decent with internet.
The VDR is a JCY-1900 module (seen in this NTSB video at 7:07 )
Quote from manufacturer's brochure:
The systems diagram from the manufacturer's brochure is attached to see what could have been connected to the device. Sounds like a...
What I can see from this image, and previous "marinetraffic" AIS data, is that there seem to be very few GPS datapoints after the ship made the turn into the straight. Unfortunately I can't download the historical data as there is a paywall...