A question for you MDR pre-flight planners. Having noted the proportion of max drift to apply for heading correction, do you also apply the head/tailwind component to your planned TAS to obtain a GS? If you do, and the result is something like 103 kts, how do you then calculate the time at a visual fix 17 miles along track? In your head, on your fingers - or with a calculator?
Or do you say "Well, 103 is nearly 105 which is 7/4 miles per minute. 4/7 of 17 is err, umm, seven fours are 28, four tens are 40, so that's 68/7 which is err, a bit under 10 minutes."
Which is a bit gash if you then try to estimate your revised ETA when you are early/late at the 17 mile fix 1/3 of the way along the leg!