The Garmin GPSMAP 420 is a marine GPS chartplotter that is designed for use on boats and other watercraft. It features a high-resolution color display that provides detailed maps and charts, as well as real-time information about your location, speed, and heading. The GPSMAP 420 is also compatible with a range of optional accessories, including radar, sonar, and weather sensors, making it a versatile tool for navigating and exploring the waterways. To protect the screen of your GPSMAP 420 from scratches, smudges, and other damage, we offer a range of high-quality screen protectors that are easy to install and provide long-lasting protection.