Eric Johnson's "Victoria" (P19): Fishfinder mount:
Here's a sonar/fishfinder mount I built from mohagany. It allows the unit to be viewed from either the cabin or cockpit, and easily swings out of the way for companionway access. The knob on the underside is used to loosen and tighten the fit of the arm to the base. I originally had the knob on top, but it was very hard to reach, so I modified it to be on the bottom.
