Hi
A new one that I believe works to calc drift angle. Note it is pretty accurate for 90 knot AS, other speeds above and below this you need to use a little sensible compensation.
The Angle between track wind direction (head wind or tail wind so you cant have a greater angle than 90 degrees)
divide this by 10
Wind speed divide by 10
Then multiply the two together equals drift angle.
Example
A/C Heading 030, Wind is 060/15
Wind angle is 30 degrees from right
30/10=3 15/10=1.5
3x1.5= 4.5
Therefore a correction of 4.5 degrees to the right is required yo account for drift.
This is easy enough for training aircraft that generally cruise around 90kts.
All the Best
mint