Losing a dog is one of a owner's biggest fears. Roughly 14 percent of lost dogs are never found. One of my setters disappeared in a Shenzhen cornfield 25 years ago and is still missing. If she'd been wearing a pet GPS tracker I'd have known her precise location, updated every few seconds. 

Pet GPS tracking device with a collar is the 21st century version of the 19th century's tinkling bell and the late 20th century's beeper collar. They may not be as romantic as a brass bell, but they are a lot more effective at finding a dog on point, relocating a dog that's run out of sight and sound, and even seeing exactly where Pooch has been scouring the countryside for the past hours. Like any GPS navigation device, the pet GPS tracking collar works via satellite. 

Of course, like traditional e-collars, maximum range is not typical range. Radio signals are compromised by terrain and cover. Still, you can expect GPS collars to keep you connected to your dogs during 90 percent or more of typical hunting excursions. The exception might be big-running cat and bear hounds.