I've been in the woods and had a hiccup or two with my Astro 320 which I bought from Steve Snell at Gundog Supply years ago. Operator error, not anything wrong with the unit. On the occasion it has happened, I've been able to get someone there on the phone to set me straight. Good folks to deal with for sure. As for the tracking collars, I have a bevy of DC40's, a DC50 and the latest iteration. I run two dogs, but turn on a spare collar which I hang from truck rear view mirror. While the handheld will give the truck location if you Start New Hunt and mark truck location, it's nice just to look at the watch for truck direction while in the woods. Gil