The Camera Boxes are one of the main things to get in the game. After being scanned ,their red light will change to green, causing a map to appear on the gamepad. When entering a new location, always find the box as it will be a vast improvement to your survival. Your first mission will be to scan 2 of these in the supermarket area.
In some areas there are jammers that will cause your map to vanish. In order to fix this you must destroy the Jammer. This is quite easy to do as all it takes is one simple swipe of the Cricket bat. Don't hesitate .