Yup, what Ifernat said: The scales on the right-hand side of the map are your nomometer. And it is fantastically useful and necessary for plotting intercepts.
If you get a radio report of a convoy moving at 8 knots due east, and you know it's going to take you 3 hours to intercept, you can use the nomometer to tell you how far the convoy will move in 3 hours at 8 knots by drawing a line from the 8 knots on the left-most line to 180 minutes on the right-most line. Where it crosses the middle line tells you the number of kilometers it will move. You can then refine your intercept.
The radial overlay is also very useful as it shows relative bearing and distance around your boat.
Steve
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