Way wrong question!!
I had one on my 1st boat. It was unreliable and inaccurate. Didn't work at slow speeds. I replaced it with a device that had a little paddle wheel on. It was far superior. Maybe they should try that? Just kidding.
BAN all pitot tubes. They are completely unnecessary in the electronic age. This is not the only crash or near crash associated with malfunctioning or blocked pitot tubes.