"Michael Porter" wrote in message
...
Gotta be very careful though -- with analog transducers, the length of
the cable is figured into the delay time which is what the souonder
uses to work out the depth. Might have to recalibrate.

No it's not. The delay in a coax cable is next to nothing compared to the
delay in water. It's the capacity of the cable which is part of the resonant
circuit that drives the transducer.

Meindert