The ONWA KW-360 is a powerful, lightweight, and versatile ultrasonic weather station designed for applications that demand high reliability and low maintenance, particularly in the harsh marine environment. Unlike traditional mechanical anemometers, the KW-360 is a solid-state sensor that uses ultrasonic technology to simultaneously measure wind speed, wind direction (across a full 360∘ range), air temperature, air pressure, and humidity (with altitude available on some models). This design means it has no moving parts, ensuring it requires no maintenance and no calibration throughout its lifespan. Encased in durable, UV-stabilized ABS plastic for maximum resistance to weather and corrosion, the unit features a wide operating voltage range and low power consumption. It communicates essential weather data digitally using standard NMEA 0183 sentences ($\text{\$MWV}$ and $\text{\$XDR}$) and offers connectivity via RS232 and RS485 to interface easily with ONWA chart plotters, multi-function displays, and other compatible navigation equipment.