installed instrument I need is the Raymarine
ST40 depth finder. My Garmin
GPSMAP 76S gives me everything else.
Why would you drill a
hole in the bottom of your boat if you don't have to? If you are replacing an
existing thru-hull 'ducer, have a wood or steel hull, or can't find a good spot
to shoot thru the hull maybe it makes sense.
There are two types of transducers for the ST40. One requires
that a hole be drilled in the bottom of the boat, the other is the In-hull type.
In-hull transducers (a.k.a. shoot-through) are placed directly on the
inside of the hull. I chose the AIRMAR
Model P79 transducer because it installs quick and easy.
If you browse the archives of the hunterowners.com
forum you'll see lots of discussion on in-hull vs. thru-hull transducers. In the
H260 the location next to the bilge pump
is the preferred location. Go to this
link for more on this advantages and disadvantages of this type
Raymarine says the transducer should be expoxied to the hull but some people
have just used toilet ring wax to stick it to the bottom of the bilge. That
makes it removable. I used the wax to test it first then after I was sure it
would work, I used 3M4200 sealant to secure it in place.
I installed the transducer next to the bilge pump. It has worked without a
hitch. The install instructions are easy to follow.
The ARMAR-79 'ducer
works with virtually all displays and is sufficient for the average boat.