What values are used for the forecasted wind at higher levels?

Question

ATPL - Airline Transport Pilot license - Meteorology - What values are used for the forecasted wind at higher levels?

QuizVDS · Accepted Answer

Direction relative to true north and speed in knots

QuizVDS · Answer

Direction relative to magnetic north and speed in knots

QuizVDS · Answer

Direction relative to grid north and speed in km/h

QuizVDS · Answer

Direction relative to magnetic north and speed in km/h

ATPL: What values are used for the forecasted wind at higher levels?