Favourite Rules of Thumb
Few comments on here about rules of thumb, and I just wondered what people's favourites were. Mine are:
1) Distance from tip of thumb to 1st knuckle is 10nm.
2) Tip of thumb to tip of little finger when hand is outstretched is 70nm.
3) Max drift for around 100kts in a spamcan is wind/5 * 3 = max drift (eg wind 15/5*3 = 9 degrees max drift)
4) Use of the clockface to work out how much wind to allow for.
...any others.....?
Having said that I've just bought myself a Garmin 96C and was wondering whether Navbox or something similar would be a smart purchase as well. Any advice?
C23