this was on my boat when i bought it last year
i tried it saturday 6-19
it showed top speed/temp fine
showed down temp but not down speed..... was going 2.6 on GPS and unit showed 0.5 once
dont know if probe is going bad or if there is an adjustment to be done
if interested $150.00 plus shipping if needed
I am between oswego and henderson so could meet in either place if possible