I was taught the 6 min marker technique. When I had the nav gig sorted and was working in the Kimberley (remote area Western Australia)
I found the method as described by Ozgrade 3 to be the most practical. Also makes a good poor person's DME. With the 10 or 20 nm markers the distance was fixed, ie didn't have to rub them out and start again. If you had 2 or more flights on the same day it could mean a rather cluttered map.
So, my point, it is vital that the student has at least one method that works. Then, with some experience they can modify it to suit them and their needs.
thank you.
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reddo
Life is good 'till the next stuff up.