CNP-3 Flight Navigation Drawing Rule with Angle Distance Scale Functions

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

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

Lightweight CNP-3 Navigation Slide Rule Designed for Portable Flight Use

CNP-3 Flight Navigation Tool Compatible with Paper VFR IFR Approach Charts

CNP-3 Plastic Navigation Slide Rule Resistant to Oil Seawater and Fingerprints