Oldest trick in the book:
Just look at your compass rose, HSI, EHSI or what type of instrument you're flying the approach on. In most cases it has a inboundcourse coinciding to the relevant runway track set to it.
- Put a finger on the number relating to the reported wind.
- Trace a line parallell and perpendicular to the inboundcourse on the instrument.
- Note where the parallell line intersects the inbound course and where the perpendicular line intersects with the deviation dots.
It makes it very easy to see what percentage of the wind you have coming in from the side and the nose/tail component. Just multiply that with the windspeed and you're home free.
/LnS