iv heard that folks do that in case 1 syste fails or 1 looses signal and the other sys can be used. i huntd with a guy who ran both and thats what he told me. where he would hunt is very dense foilage canopy and the garmin would loose sat signal and he could use the radio telemetry collars to find his dogs.
The Garmin is one handy tool probally one of the handest there is!!But it is not always accurate!!It has been known to lie in some places like river bottoms!!
So we put old faithful on just in case!
I have had to use my wildlife 3 times in the last 3 months!!
The wildlife will tell you the direction the dog is in only!!
The garmin will tell you when they are scratching fleas!!!lol
I luv the garim but my dogs will not get turned loose without both!!
We hunted the hill country the other day and it worked great!!In that country!!