Verified answer

When you tag someone with the drone, that player's movement will be tracked on the radar until they die. And turrets are marked since they aren't people, they are equipment.

The recon drone just flies around and targets people on the mini-map. The flash you get when you are "tagged" is just signaling that you have been tagged. The arrows and boxes thing just lets you know if it is a person or equipment.

Hope I was helpful.