Part 1 - What you need to learn about the ECDIS. The truth is, when i was a third officer, I had no DAMN idea what these functions of the ECDIS were. I thought they were for 2nd officers. I was wrong and I learned it the hard way. It was my first vessel as a 3rd mate. We were arriving at a busy port when the ECDIS froze and the captain quickly asked me to restart it, which I did. The ECDIS switched on but it was blank. There is no route, no user charts, no AIS etc. so the captain asked me to set