Figure F4. On the VIT frame, the 4.252-kHz transducer is the squat cylinder in the middle under the frame's lower horizontal member. The batteries and electronics are in the yellow cylinder to the upper left marked "Pinger."

Figure F4. On the VIT frame, the 4.252-kHz transducer is the squat cylinder in the middle under the frame's lower horizontal member. The batteries and electronics are in the yellow cylinder to the upper left marked "Pinger."