Transom Mount or Through Hull Mount
There are four main mounting systems for transducers.
Transom Mount
The transom-mount transducer is the easiest to install of all the mounting systems. It's the most popular and usually less expensive.
The transom-mount transducer can be purchased in single or dual frequency models.
A plastic transducer is recommended on aluminium or steel-hulled boats.
Transom mounting is ideal for high-speed operation.
Bolt-Thru-Hull Mount
This is the second most common form of mounting and it is for larger boats. With the Bolt-Thru-Hull Mount, your transducer is physically located in the water. A hole is cut in the hull and your transducer is mounted through the hull by means of a threaded shaft and nut.
Shoot-Thru-Hull Mount
With the Shoot-Thru-Hull-Mount, your transducer is inside the boat. The transducer is bonded to the inside of the hull with epoxy.
The signal "shoots through" the hull with some loss of signal strength. The downside is that 'shooting though the hull' weakens the signal. The upside is that you don’t have to cut a hole in the boat. This type of mount is recommended only with 192 or 200 kHz transducers.
Trolling Motor Mount
The PD-W "pod" transducer is designed for mounting on an electric trolling motor. It has two slots for a hose clamp (which must be purchased separately). Skimmer® transducers can also be mounted on a trolling motor using the TMB-S trolling motor bracket. It's curved to fit the contour of most electric trolling motors.
Read about Transducer Installation & Mounting...