Time stamping in PGNs helps in what way?

• A. It increases network traffic by 50%.
• B. It helps synchronize data across devices and improve correlation of measurements.
• C. It eliminates the need for a backbone terminator.
• D. It is only used for post-flight analysis and has no real-time effect.

Answer: (B)

Time stamping PGNs provides a common temporal reference across devices, enabling synchronization of data and accurate correlation of measurements. In a NMEA 2000 network, sensors and instruments publish PGNs at different times, and attaching a timestamp to each PGN lets processors align data from GPS, engine, fuel, and other sensors as if they were measured at the same instant. This real-time alignment is essential for data fusion, reliable navigation and diagnostics, and for reconstructing events later with precise timing. It also supports accurate logging and post-analysis, since you can determine exactly when each measurement occurred relative to the others.

Time stamps don’t inherently increase network traffic by a fixed amount, and they don’t remove the need for a backbone terminator in the CAN network. Their value lies in real-time data correlation and synchronized multi-sensor interpretation, not just in retrospective analysis.