Ubidium always uses time of day to record times, the timebase of Ubidium is maintained by an internal clock with an accuracy of 0.28ppm when powered on, this is equivalent to a maximum drift of 0.024s per day.

By default Ubidium will use GPS time when available, during the Startup Process Ubidium will automatically try to sync to GPS time, this should always be done outside in an open space, away from any buildings, when possible. It is important to ensure that the Timezone is set correctly to ensure the GPS time is correct for your location. 

If a GPS time sync is obtained then the system will continuously micro-adjust the clock to ensure maximum clock accuracy. 

If no accurate GPS time can be obtained the system will attempt to fallback to NTP (Network Time Protocol), this is only available if an internet connection is available. 

In the event that neither GPS time or NTP time are available the system will revert to the time stored on the internal clock. 

The internal clock is maintained even when the system is powered off, however this uses a RTC with an accuracy of 5ppm which gives a maximum drift of 0.432s per day when switched off. The RTC will use the internal batteries when available or a backup CR2032 battery on the main board. The backup battery has an estimated life span of 20 years even if continuously used.