It is a transducer designed to shoot through an aluminum hull....

http://vexilar.com/pages/accessories...ducers_au.html

Also.........has anyone tried to mount a regular transducer to shoot through the hull.

I have a skimmer on my tracker, and I've broken it off more than once, and would like to get high speed readings working.........

Any help would be appreciated.

Later.

Geo