Student Navigation - Time or "Fractional" Marks?
As an instructor, do you prefer your student to have "time" marks (say every 5 minutes) or "fractional" marks (say quarter, half and three quarter marks of distance along track) plotted on the planned track?
Personally, I prefer fractional marks since this makes revision of ETA easier - ie one minute late at quarter way means two minutes late halfway, etc., whereas time marks assume that the grounspeed is correct.
Just wondered which you preferred to use and why?
Also, what do you think is the key to teaching pilot navigation and do you have any handy tips for making the learning process quicker/easier?