When switching on for the first time the LEDs will flash repeatedly until a GPS fix is located (FIG.1). This can take 10 minutes on first power up, but 2/3 minutes for subsequent power ups.
When a GPS fix is located the Shot Scope band will light a single led (FIG.2).
Best practice: switch your Shot Scope on 2/3 minutes before you tee off. If you enter a building/halfway house check you have not lost GPS signal.