The standout feature is MotionScope, Garmin's Doppler-based moving-target technology that colour-codes approaching and receding contacts on screen, so a boat genuinely closing on a collision course is immediately obvious against stationary clutter and land returns. The 18x delivers 50 watts of output power with up to 48 nautical miles of detection range, a fast 60 RPM rotation for quicker screen refresh on fast-moving targets, and a 5.2-degree horizontal by 25-degree vertical beam width. It's plug-and-play compatible with Garmin's GPSMAP 7x2, 7x3, 9x2, 9x3, 10x2, 12x2, 12x3, 7400, 7600 and 8000-series chartplotters over the Garmin Marine Network, so no separate radar processor box is needed -- just power, network cabling, and a compatible mount. Being solid-state rather than magnetron-based also means lower radiation exposure at close range, which matters on smaller flybridge or hardtop installations where the dome sits relatively near crew.