Maretron Ultrasonic Wind Weather Antenna [WSO200-01]Ultrasonic Wind & Weather Antenna Maretron's outdoor weather station measures wind speed and direction, air temperature, barometric pressure, and relative humidity. The wind measurement is performed using ultrasonic sensors, which means there are no moving parts to wear out or get caught in the rigging. The WSO200 accurately measures wind speed and direction under a tilt of up to 30, making it ideal for sail as well as power conditions. When used with