Flight Training Slide Rule CNP-2 for Chart Measurement Angle and Distance Calc

CNP-2 Flight Navigation Slide Rule with Angle Distance Scale Conversion Tool

Aviation Slide Rule Oil And Seawater Resistant Angle And Distance Conversion

CNP-2 Electronic Scale Slide Rule for Pilot Training and Paper Chart Navigation

CNP-2 Flight Navigation Slide Rule with Angle Distance Scale Conversion Tool

CNP-2 Slide Rule for Flight Navigation Use with 90% Light Transmittance Feature