All depth sounders "tick" a little when they transmit. The sound is audible
with the ear, although very silent. You can also
put your finger on the bottom end of the transducer and "feel" the
transmission. (In case you have a removable depth transducer or
your yacht is on land) This is a rough test and does not really tell if your
transducer is receiving the echoes or if your instrument
is working, but the audible tick and tiny tapping is a precondition for the
transducer to work. Have tested new installs on
maybe 100 different yachts depth transducers this way (all Raymarine or B&G,
both using Airmars transducers) its has proven to
be a very good and easy primary test on yachts on land.

Regs,
TomS


wrote in message
...
Ladies & Gents

I have a Navman 3100. Depth worked fine last season bu tshows nothing
now. Is there any way to check the depth sounder cable to determine
whether is was damaged over the winter? A visual inspection of the
accessible parts of the cable has shown nothing unusual.

Many thanks in advance

Matt