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. Over $600 new. For full details visit the Canadian Binnacle Marine website: https://ca.binnacle.com/m187/Raymarine/p8787/Raymarine-i40-Wind-System-with-RotaVecta-Masthead-E70144/product_info.html or visit the Raymarine website: https://www.raymarine.com/en-us/our-products/marine-instruments/i40-series/i40-wind