Raymarine Quantum Q24D Doppler 18" RadarRaymarine Quantum Q24D Doppler 18" Radar Raymarine Quantum Q24D Doppler 18" Radar represent the next generation of marine radar, the Quantum 2 doesn't just show you what is out there; it uses advanced Doppler processing to tell you exactly where its going. Whether you are a weekend sailor or a serious motorboat cruiser, this solid state radome is designed to take the stress out of navigation. The Raymarine Quantum 2 Q24D is a compact, 18 inch solid