A #rule-of-thumb for determining [[crosswind component]].
Add 1/6 for each 10° of crosswind, up to 60°. Then multiply by the total wind to find the approximate crosswind component.
> [!example]
> With a 20° crosswind:
>
> $
> \frac{2}{6} * wind = crosswind
> $
This is simple enough to use in flight while keeping a reasonable amount of precision.
| Angle | Sine | Rule of Sixths | Decimal |
| ----- | ---- | -------------- | ------- |
| 10 | 0.17 | 1/6 | 0.16 |
| 20 | 0.34 | 2/6 | 0.33 |
| 30 | 0.5 | 3/6 | 0.5 |
| 40 | 0.64 | 4/6 | 0.66 |
| 50 | 0.77 | 5/6 | 0.83 |
| 60 | 0.86 | 6/6 | 1 |