Why would anyone keep such a system in their boat ? I would immediately swap it out for a cable system.
If you are contemplating a purchase of a boat with electronic controls immediately knock the price of replacement off the price and explain why.
I had a friend who had an early auto pilot system which often malfunctioned whenever he got close to a large metal object (bridge, large ship, loading docks, etc.) It was a ticking time bomb !! same for these electronic controls, get rid of them.