Which is the purpose of the altimeter subscale?

Question

Question Quiz BPL Hot Air - Balloon Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

To reference the altimeter reading to a predetermined level such as mean sea level, aerodrome level or pressure level 1013.25 hPa

QuizVDS · Answer

To correct the altimeter reading for system errors

QuizVDS · Answer

To set the reference level for the altitude decoder of the transponder

QuizVDS · Answer

To adjust the altimeter reading for non-standard temperature

Id 49 - BPL Hot Air - Which is the purpose of the altimeter subscale?