Track Boxes have 2 methods for syncrhonisation of the internal clock, Track Boxes are always synchronized to UTC time and the time recorded in your event file will be based on the event time zone. The Track Box will continuously micro-adjust the time using either method to ensure the time is always as accurate as possible. 

GPS Time

The Track Box will primarily use the on-board GPS module to synchronize to GPS time, this will provide the most accurate time in all scenarios. Leap Seconds will be automatically accounted for by the firmware to the current default.

NTP Time

In the event that GPS time cannot be retrieved then the box will next attempt to sycnhronise using NTP through GSM. In this case the Track Box will attempt to communicate with 3 different NTP servers to maximise the precision. If the variation between different NTP servers is too great, which may be caused by weak GSM signal and communication delays, the box will continue to communicate with the NTP servers until an accurate time can be achieved.