for GPS watches, it was measured against a professional-grade measuring wheel that gauges distance The Sportline Calorie, Step, Distance 345 is part of the Pedometers test program at Consumer Reports.

The best GPS dog trackers offer real-time tracking and long battery life so you never have to worry about losing your pup.

More advanced trackers, like Invoxia, use GPS or cellular technology. These devices offer real-time location updates regardless of distance ... a tracker can be attached to a walking aid or ...