Sharpen your radar picture with high definition. The GMR 18 / 24 HD radar scanners offers a whole new level of radar performance, safety and situational awareness. Both scanners features high-powered Digital Signal Processing, providing sharper radar imagery and improved target separation to recreational boaters, professional mariners and yachtsmen. With automatic pulse optimization technology, the radar matches pulse widths and repetition rates with the nautical mile range that is selected. This gives you powerful 4-kilowatt radar penetration and unbelievably clear echo definition at all ranges.