"BrianR" wrote in message
...
If both sounders use the same frequency, which they probably will, then
yes they will interfere with each other.
A sounder works by measuring the time it takes for the signal to travel
from the transducer to the bottom and back. If two sounders are operating
at the same frequency they have no way of determining which signals return
they are receiving.


If that was the case wouldn't you expect to see interference when sailing in
close proximity to other vessels with echo sounders running? I never saw any
sign of this