Rear Golf Mat ExtensionRear Golf Mat Extension For Doppler Based Launch Monitors The Golf Mat Extension adds an extra 5 ft behind your hitting mat. Doppler based launch monitors like the FlightScope MEVO+ and Garmin Approach R10 sit behind the golfer. In order to get the correct readings, these launch monitors need to be at the same height as the ball on the hitting surface (without a gap between the two). Doppler Specifications Doppler Based Launch Monitors The Golf Mat