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

CNP-1 Multi Function Slide Rule for Distance Angle and Scale Conversion

CNP-2 Slide Rule for Aeronautical Chart Use Featuring Angle Distance Conversion

CNP-3 Slide Rule for Aeronautical Chart Measurement and Scale Conversion Tasks

CNP-3 Slide Rule for Paper Chart Navigation Angle Distance and Ratio Scales

CNP-3 Plastic Slide Rule for Flight Navigation Scale Conversion and Plotting