I have to agree with Bob_VT regarding the screen size. It maybe okay for those with young 20-20 eye sight, but on the tough side for those who have less then 20-20 vision.
But I like the concept of seeing my partners location on a screen. This past season we were equiped with FRS/GMRS radios that did a good job for us. If we all had gps units we could have advised our counter parts our lat/long and new waypoints could have been created if needed. A time consuiming but workable answer. If your partner gives you a discription of the next to the large rock, up in the big brush field it may or may not work. I know my old English teacher and outdoors woman would not have bought off on it. Which brush field and what rock. It may work in areas that the hunting party knows, but difficult when members do not know the area.
A hunting partner suggested that he might like buy a pair of the Rhino series radio, but I think I will talk him into looking at the screen before he buys. I notice that he was putting on a pair of reading glass to look at a map this fall.