Glossary - O OBS mode.   The name for the nonsequencing mode on some FMS/RNAV units. See nonsequencing mode. Onboard lightning detection systems.   An onboard weather detection system that senses electrical discharges that suggest the presence of thunderstorm cells. Onboard weather radar.   An onboard system capable of detecting significant masses of precipitation. The primary use of weather radar is to aid the pilot in avoiding thunderstorms and their associated hazards.

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