If I don't want to do that whole geometric calculation, I just guesstimate:
I check the target's heading and speed (slow for 6 knots, medium for 9 knots). I multiply the speed by 2 - the target will do 12 km per hour when travelling at 6 knots, 18 km/h at 9 knots, etc. (In reality it will take the target a tiny bit longer, but at least you will arrive before it does)
And then you guess. I would guess for example I can intercept in 4 hours. I make the target plot for 48 kms (4x12km/h). I plot my course to that point, full ahead, wait for the speed to catch up... and then check the map, as it will tell you when are you going to get there. If I can't make it in 4 hours, I increase the target's distance, if less then 4, I can decrease it.
That's my lazy procedure. But for targets really far away it may be better to learn the geometry thing. It's not that hard and it's the most precise way.
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