Just wondering if anyone who has upgraded recently has a working ST50 Knot meter for sale. I had mine die last fall and I want to replace it before I upgrade to a bigger boat. I don't want to buy a new ST60 and then sell the boat. I am certain the problem is the display unit because I found a a 'chip' rattling around inside the display unit. I tried to reattach and it did not take. If you have one contact me with a reply to this post. Thanks.