The Grand Ayatollah Khamenei answered a question about performing Nawafil (recommended or supererogatory Salaat).
Question: When performing Nafilah Salaat whilst in transport mode (car, plane, train, horseback, etc) or walking, and also when staying still and out of free will; is it possible to point to bowing (roku’a) and prostrating (Sujood), and also not face Qiblah?
The Grand Ayatollah Khamenei: Whilst in transport and walking, it is not necessary to be towards Qiblah, and bowing and prostrating by pointing is enough. But when staying still in a place, must be towards Qiblah, and also perform bowing and prostrating correctly. But it is allowed to choose to perform Nafilah whist sitting down.