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

CNP-3 Flight Planning Slide Rule for Manual Course Calculation and Scaling

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

Navigation Slide Rule CNP-1 for Flight Planning and Course Calculation

CNP-3 Aviation Slide Rule for Pilots Navigators and Flight Training Use

CNP-1 Professional Flight Rule for VFR Navigation and Cross Country Planning