GMR Fantom 18 Radar 18-inch Dome Radar with MotionScope Technology. 18-inch, 40 W solid-state, dome radar. MotionScope technology uses the Doppler effect to detect and highlight targets moving toward you or away in different colors to help avoid collisions, find flocks of birds, and track weather. Pulse Compression technology provides high resolution while maximizing energy, to enhance detection and identification of targets. Target Size allows you to adjust the size of objects on the radar image. 20 foot to 48 nautical mile detection range.