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

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

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

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

ABS Navigation Slide Rule Model CNP1 CNP2 CNP3 KCNP1 for VFR and IFR Chart Work

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

CNP-2 Transparent Plastic Navigation Slide Rule for Pilot Chart Interpretation

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