Raymarine I40 Wind System with RotaVecta Masthead Transducer. This was installed on my daughter's sailboat for three years. The display unit was inside a fully enclosed cockpit and protected from the elements. Works great, but it was not compatible with a new autopilot system. For full details visit the Ray Marine website: https://www.raymarine.com/en-us/our-products/marine-instruments/i40-series/i40-wind