It’s been a long time… Here’s another one in the series “Track my Baby.”

Karen Balbi, a 21 year-old Brunel University design graduate, has created Trac, a system made of a transmitter that fits on to the child’s belt buckle and a receiver for the parent.
When the kid is out of sight, the location of the transmitter can be tracked via its built-in GPS technology.

The information is then sent by radio waves to the receiver which has a built-in screen with arrows to show the direction of the child.

From BBC.