Wind direction in route planing mode

[Piotr 3u]

Could you kindly explain me the diffrence between:

1. Left to right
2. bottom to top
   North up- is ook for me this is very natural for me
   In what cases we can use this mode?
   Than you for information
   Piotr
   

[idefix37]

@Piotr-3u
The default setting is North up. Left to right means that the wind direction reference is the mobile course as if you were moving from left to right side of your screen. So in the planner diagram it is the “relative true wind” you observe on the mobile.Same for Bottom to top.
However Left to right and Bottom to top is an alternative to North up mainly used by aviation people.