I talked with don1reed about this once, and he said he indeed made an error in the speed versus range scale. (he felt embarrassed and wished the thread would never be summoned again
) If you want to move the circle from between the plotmarks (3.3km in 3m15s= 33knots, indeed not probable in the game, he probably made the numbers up) onto your speed vector
IT ALSO must be according to the 3m15s rule: ownship speed vector must be 1.3km long, not 13.0! With a (very) crude drawing i get a target SW course. But I don't have the time right now to calculate exactly.
Or if you want to keep the speed as shown in km (1kts=1km), then you should draw a line along the direction of the 'plot'-circle radius, but ignore the lenght of the arrow instead use 33km as length.
But probably best is to commit yourself to work with any speed as km/h instead of knots. Only convert to knots when needed to set a dial in the game.