See Far And Near With One Compact DomePerfect for a wide mid-sized to large sailboats, HALO20+ comes in a compact 20-inch dome antenna and delivers high-quality short, mid and long-range detection. Monitor two distance ranges at once in Dual Range mode so you can keep an eye on far away weather cells while watching for collision hazards up close. HALO20+ radars pulse compression technology means no compromises in detection at either selected range, while beam sharpening provides enhanced separation between small or distant targets.The Best View To Avoid CollisionHALO20+ radar does a full 360 degree sweep every second, thanks to its industry-first 60 RPM rotation at ranges up to 1.5 nautical miles. These ultra-fast updates give you an almost real-time view at close range, offering the ultimate view for collision avoidance of fast moving targets.  Built-in VelocityTrackDoppler TechnologyVelocityTracktechnology grands instant visual feedback on whether targets are coming towards you