The NMEAnalyzer iPad app shows NMEA 2000 messages as they come in over time. The messages are split across up to 48 channels using various modes (screenshot shows PGN mode). A message is represented by a vertical bar.

A draggable cursor is used to select a message and view its details. The message graph supports full pan and zoom.

The message stream, received from a NMEA 2000 gateway (e.g. Actisence’s W2K-1), can be recorded to a file for later playback and inspection.

NMEAnalyzer will be available in the App Store soon.