On Sun, 7 Dec 2003 23:02:32 +1100, "Grumpy"
wrote:

Hi Guys,

Hear a theory the other day, what do you think. Once you have located your
fishing spot on the sounder, it is an idea to tun the sounder off. I was
told it spooks the fish.


Any ideas?

Back in the old days of chart sounders (I still have one here, an old
Furuno!!!), that was true. The sounders made fair bit of noise as the stylus
plotted the depth. This noise was transmitted though the hull, especially with
alloy/aluminium boats.