Thanks for the instruction of testing the spot for good signal.

I am thinking of doing these to find the best spot:

- With the boat sitting in the water, position the transducer over
the gunwale, hold it in the water, and check the signal. Filling the
bilge area with water, hand holding the transducer in a couple spots
inside the bilge area, and compare the signal with what I get when I
hold the transducer over the gunwale. Hopefully, I can find the a few
good spots in this way.

- Use the method that you have suggested to secure the transducer
temporarily in the best spot that I have found in the previous step.
Run the boat in various speeds to see I still can get good signal. If
not, re-position the transducer using the method that you have
described, and run the boat to test again...

Hope this will work. I will see when spring comes.

Now, I just need to figure out if plumbers putty will stick to wet
surface. If not, I will have to find a different adhesive material.

Jay Chan


Bill McKee wrote:
wrote in message
ups.com...
I would like to get some info about fishfinder:

1. Is this OK to mount a "shoot through hull" transducer right at the
center line of the boat hull? The center line of the bottom of the hull
is smooth; therefore, I am not expecting any turbulent at the center
line. The reason why I ask is that we are not supposed to mount a
transom-mount transducer at the center line where the outboard motor is
to avoid the turbulent from the propeller. I am hoping that this
restriction only applies to transom-mount transducer, and doesn't apply
to "shoot through hull" transducer.

2. Is "shoot through hull" transducer good enough for scanning the sea
bottom for fishes? In other words, I would like to know if I can use
the fishfinder as a fish-finder instead of using it as a depth-sounder
if I use a "shoot through hull" transducer. I only intend to use the
fishfinder in shallow water, like 10-ft to 150-ft; hopefully, losing
some range will not be a problem.

3. Does 3-D fishfinder present a relatively static picture instead of
scrolling endlessly like a regular fishfinder? I have a hard time to
interpret the scrolling image displayed in a regular fishfinder to
relate it to the sea bottom. I am hoping that a 3-D fishfinder can
solve this problem. Yes, I have already read a book about fishfinder;
but I still cannot interpret the scrolling image.

4. Is 3-D fishfinder any good? 3-D fishfinder seemed to be "hot" a
couple years or more ago. Recently when I checked Cabela's web site, I
could only find _one_ 3-D fishfinder. Is this 3-D technology too
immature that no other manufacturer wants to try?

Thanks in advance for any info.

Jay Chan


Fiberglass boat is OK to shoot through the hull. Most fishing style boats
have a pad in the back area for transducers. They are made solid, no air
pockets in it. Before mounting the transducer with epoxy, make a little dam
of plumbers putty and fill the dam with water and set the transducer in the
water to see if you get good results.