I'll add another to this thread that played out in a big way for me this last season (sorry if this is a repeat somewhere in all these pages of replies) but listen at night for the bugles if your not hearing a lot during hunting hours.
I sleep light at night so i wake up to the bugles anyway, and my brain is basically listening for me while im sleeping in the woods, but if you dont sleep light at night... spend a few hours to get up around 3- am and just sit and listen if you think their are elk in the area.... Yea i get it... its gonna suck cause your already exhausted from hunting all day... but it can give you a good lead on what direction to head in when you wake up in the morning
This year i woke up to a bugle across the valley from me, somewhere i never hunted, he ended up bugling once more while i was making breakfast and i went up after him, good sized bull for the unit! Never would have guessed he would be there though if he hadnt sounded off in the dark for me