Features: In addition to tracking location, many GPS devices offer a multitude of features, including one- and two-way calling and the ability to set up geofenced zones that alert you when your child has left a designated area. I looked at which devices went beyond the basics and how those features were implemented.
Performance: You want a GPS tracker that accurately displays a person's location, with frequent updates when he or she is on the move. I took note of how accurately each device pinpointed our location.
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Design: I considered the size of the GPS tracker and whether it was something a child could easily carry around. I also looked at durability: Could the device withstand rough-and-tumble trips to the playground?