What type depth finder do you have?
Yes I am on vacation but unfortunately not on my boat. Of course its been raining non stop all week so not so bad.
Andy answered the question correctly. The display unit eventually died as the LCD seemed to bleed out. Had it repaired once by Raymarine (free at that!) but it did it again. That is why it is replaced.
I would never suggest that anybody by a fishfinder rather than a depth sounder for a sailboat. Especially one with a transom mount transducer. But it was free and the alternative was not. The replacement thru hull transducer was very expensive and not worth it. The FF worked very very well for depth and did not max out even in 130 feet of water.
I am very happy to have a proper instrument now tho.
... on vacation ...