best bet is to use the 3minute 15sec rule.. Take bearing and range of the target every 3.15 minutes and plot it on the nav chart. The distance between points is the speed: 100m = 1 knot and 1000m is 10 knots.
The eye thingy on the notepad puzzled me also in essence it's a computer automated thingy of what your doin at the 3.15 thingy
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