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I think this is all good, except what is the accuracy required when they ask for exact answers to the nearest whole number, instead of multiple choice. If I enter 745 and they want 750, then that is just setting someone up to fail, if their accuracy only accepts answers that are 1 point out, but I guess as you say, that's just exams and theirs no point in arguing with silly CASA exam writers.
with more than enough reasonable accuracy for the exams
I do think this will help and will take to the next exam. I was previously using a torn off piece of paper to quickly mark spacing from one measured point to another point along the chart. That seemed to work ok, but I think callipers would be a little more accurate.
quality set of dividers/compass to measure initial spacing
Might be a good idea to make a video showing this.
I show my students the background to the technique. They don't appear to have any difficulty understanding the process so it's not all that difficult, I suggest.
Exactly what I was thinking. There's margins built into the charts for ops safety, so why require exact answers in the exam. Multiple choice, I suggest, is much better at letting the examiner know if you understand how to use the chart.
Do they employ draftsmen with T squares and Set squares and give them all day to get an exact answer? This never was the idea behind P charts when they were first introduced.
It was simply to give a pilot a method to quickly assess whether a take-off or landing could be safely carried out with generous margins applied to allow for inevitable inaccuracies in determining such things as headwind components by reference to a wind sock 50 meters away.