This is a great reply. I am following the thread because this topic interests me as well. I am 76 this year, two heart attacks (@53), back issues, very poor mobility, and every other thing that can either fall apart, break or have had removed; 152 years of wear-and-tear on a 76 year old body. Boy....I look in the mirror and ask, "How did you get here???" Anyway I recommend to anyone who has health issues and concerns about getting emergency help to look into the InReach 2 Mini device; like $400 and I just saw them on sale for $350 with a rebate. I black bear hunt in Maine, there's absolutely no cell service where we hunt, I'm about 1/4 mile into the woods off of a tote road and totally alone until I get picked up 5-6 hours once I've been dropped off. With the InReach2 Mini I don't have cell service, however I "do" have the ability to text, and...there is the "emergency" button that is monitored and again one can text back and forth to the monitoring system. Once the emergency button is hit, even if you do not answer a text back the cavalry/help is coming. I just read of an incident in the west where a father and son were hunting and they were attacked by a grizzly. In the total mayhem the father, in addition to being mauled, shot himself in the leg with a handgun; that gotta really have sucked!!! Anyway the son hit the emergency button on the device and when the son and father arrived at a ranch there was an emergency crew and helicopter there to life-flight the father to the hospital. There are different monitoring plans for the InReach, I chose one where it is a one-time activation fee of $35 annually and then like $14/month after that. I chose a plan where I can turn on or deactivate the device on a monthly basis.I'm assuming you have had your Dad checked for essential tremor and Parkinson but if not please do. I know a respected shooter that has had to add medication for essential tremor. You didn't mention if this was a guided hunt or not. Either way you need to make sure you have a way of emergency communication in the field.
I'd also like to congratulate this OP for taking his father out and keeping him in the loop for hunting. My two hunting partners, son and son's best friend, have vowed to get me out to the ground blind even if they have to drag me out there in the bear tub or in a wheelbarrow. I also have been looking at the Death Grip Bog pod also. Anything that will help to keep on keeping on!!!