An apparatus for mounting equipment on a waterborne vessel includes a base member configured to support an instrument. An elongate spacer arm is connected to the base member. A selectively deployable elongate transducer arm is pivotably coupled to the spacer arm. The transducer arm is configured to pivot between a deployed position and a stored position. The length of the transducer arm is at least sufficient for the transducer end to reach the water surface when the transducer arm is in the deployed position. The spacer arm is substantially parallel to or collinear with the transducer arm when the transducer arm is in the stored position, allowing the apparatus to be folded for compact storage.