* Data from sensor is provided with UTC time stamp and as such can always be properly referenced.
** Inaccuracy of data from sensor is of a much larger magnitude ever recovered by millisecond timing.
*** No LAN interface can be properly time stamped upon reception. Data needs to be synchronized to Time Synchronization and time stamp provided in the data message.
Finding and applying latency
Please refer to the following document, where the 'Wobble Tool' is used to determine latency: How-to Qimera - Using the Wobble Analysis Tool.
Problems with time tagging of sensor data have always been the whipping boy in the hydrographic industry. This problem must be seen as a shared problem between sensor manufacturers and data acquisition system manufacturers. The former is responsible for the internal sensor latencies; the latter is responsible for proper handling of data. As long as this is not seen as a shared problem, bringing electronic timing devices in to play that will time tag sensor data upon reception with extreme accuracies may end up in flogging a dead horse.