The Em-Trak B400 AIS Class B is a powerful and tough AIS Class B ideally suited for offshore and professional mariners. As an SOTDMA type Class B, the B400 enjoys transmit power of 5W instead of the standard 2W as well as transmit priority in busy areas. This translates into enhanced operational performance. The B400 is a robust, weatherproof, fully integrated unit incorporating a high resolution full color display, CMAP charting and a broad range of functionality. Its flexible connectivity options that include WiFi, NMEA0183 & 2000 make installation and interoperability with your other systems quick and easy. A wide range of functionality including MOB & SAR alert tracking, alert tracking, real time AIS AtoN sensor information display, filters, alerts and much more make this an essential device for any serious mariner.