During a flight over the sea at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1012 hPa), the true altitude is constantly increasing. What action, if any, should be taken ?

Question

Question ATPL - Airline Transport Pilot license - Meteorology

QuizVDS · Accepted Answer

None, the reason for the change is that the air around Palma is warmer than the air around Marseille

QuizVDS · Answer

Have your altimeter checked, because its readings are obviously wrong

QuizVDS · Answer

Compensate by heading further to the left

QuizVDS · Answer

Recheck the QNH because one of the QNH values must be wrong

Id 40 - ATPL - During a flight over the sea at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1012 hPa), the true altitude is constantly increasing. What action, if any, should be taken ?