Well the main reason I take mine with me is because of 2 heart attacks, 3 back surgeries, 1 rotator cuff replacement, and a few other health problems.

Before all this I never took one into the woods, but it only makes sense to me. Last year one of our hunting buddies had a heart attack just after he killed a deer and had to walk to his 4 wheeler and drive it back to camp. The doctor said if he would have had cell he could have been helped sooner. He barely made it.
Also if you hunt by yourself or fall out of your tree stand it would be very usefull if you have trouble.