OK, you made me watch! I'll be right back with my observation...
I'm back. Werner says "the plot shows 7 knots and course of 1, meaning it's headed North." And he has not shown us the plot.... That is most unfortunate. For a course on plotting, you can see my Dick O'Kane Manual Targeting Video at the
Sub Skipper's Bag of Tricks thread, which starts off with a quick course on plotting, showing you how you transfer your periscope and radar observations to the nav map to determine target course and speed. Have fun!