I would. In fact, I have taken an aviation handheld with me when hiking in the mountains. (Today, I would probably leave the aviation HT at home and take my Yaesu FT-817 instead.)

But read the article on this website at http://www.equipped.org/waldock698.htm

The aircraft passenger (a licensed pilot) who survived did so, in part, because he knew the Center frequency for the area he was flying in. It's good if you know the emergency frequency, but it's even better if you know other frequencies that airliners will be monitoring.