SPERRY MARINE PRIZMATIC AZIMUTH DEVICE PV 23: The Sperry Marine Prismatic Azimuth Device PV 23 is a key instrument used to determine the azimuth, or directional bearing, in marine navigation. This device uses a prismatic mechanism to provide accurate angular readings, which are essential for determining the vessel’s heading. The PV 23 azimuth device is designed to deliver reliable results even under challenging maritime conditions, making it an indispensable tool for ensuring safe and accurate navigation.