GPS timing modules secure timing information from a cellular signal instead of a GPS signal . Timing information is typically derived from a GPS signal. When there is no GPS signal available, (for instance in an underground parking garage) use a timing module. Timing Modules are a cost-effective solution compared to using a GPS receiver that requires an outdoor antenna installation.

A GPS clock, or GPS disciplined oscillator (GPSDO) ensures the time communicated to connected devices matches GPS or other GNSS satellites. The GPS clock has two key components, a GPS receiver and a an oscillator.