I had a text file for that and have been doing the same as you with the following addition.
Based on the contacts speed converted into Km/hr (use pull down chart in GWX2), I take the ruler and draw line segments showing where the convoy will be at the top of every hour. Then, you plot a navigation line to the vague convoy track. Using your navigator and your line segments, you can adjust your intercept such that you arrive say at an intercept area a couple of hours prior to the convoy allowing optimum time to setup the shot.
Thanks for the PDF; looks nicer than my text file.
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