The NBA is investing in the study of wearable GPS devices with the probable end goal of having players wear them during games.

The league is funding a study, at the Mayo Clinic in Minnesota, of products from two leading device-makers: Catapult and STATSports.

Most teams already use the technology during practices.

Weighing less than an ounce, these devices are worn underneath a player’s jersey. They track basic movement data, including distance traveled and running speed, but the real value comes from the health- and fatigue-related information they produce.

Several GMs and other team higher-ups have privately pushed for in-game use, but they understand the league has to collectively bargain that kind of step with the players’ union. 

There is a concern on the part of the players' union on how teams uses the data and who gets to see it.