I rely on my ears heavily as well and being that I am normally around 18 feet in the air,I can quietly shift my weight and slowly look behind me every so often.I have had the good fortune to hunt out of state the last 8 years and There are no hardwood tree's so no leaves,and you can't hunt with your ears nearly as effectively.I have had a few instances where I never heard the deer coming only to have it be directly underneath me.I am always like holy s--t how did this thing get on top of me with out me hearing it.Grunt or snap a twig or something!