As mentioned - shoot the hull. There should be a location in the bilge area
that has no wood in it for you to mount the transducer at. Usually painted
black so you can find it. The signals will shoot thru the glass and work
just fine. No worry of water intrusion, rot around the screws, hitting
something and knocking it off, adjusting for the perfect angle. People will
tell you different solutions for mounting but I always use silicone.

Step 1: w/ boat in water put some water in the bilge so you are creating an
airless seal between the transducer and the hull. Move the transducer
around until you find an area where it works.
Step 2: pull boat out of water and drain all water from this area.
Step 3: clean the area w/ some mineral spirits or acetone, or something
that will not leave a residue.
Step 4: Place a huge glob of silicone where you plan to mount it.
Step 5: mash the transducer down into the silicone forcing out all excess
and bubbles.
Step 6: Allow to dry.
Step 7 (optional): Take a box knife and scraper and remove the excess
silicone. Just be carefull not to break the transducer loose.

--
Tony
my boats at http://t.thomas.home.mchsi.com



"BigBadJohn" wrote in message
om...
I am Installing a Transom Mount Transducer on my 21' SeaRay.
How high up should the thru hole be for the transducer cable?
The water line is just below the swim platform. And the black cable
won't look too nice against my white transom. Any thoughts or
experiences appreciated.

TIA