Another option that you have is spot and stalk. Try finding their bedding area. Take one step, look around REAL GOOD, wait 3 or four steps, and then do it again. Repeat as needed until you see what you are looking for. Watch the wind, as their noses will smell you from a long ways away. Check creek bottoms, or if you can find some scrapes, set up a comfortable place to sit and just wait. Set up overlooking a creek bottom on a ridge, and glass everything. Patience and homework will eventually pay off.