Nthawi yowonetsera imasungidwa mu khadi lolamulira, koma pakapita nthawi, nthawi ya khadi lolamulira ndi nthawi yokhazikika zidzakhala zolakwika ndipo ziyenera kusinthidwa pamanja. Ngati khadi lowongolera likulumikizidwa ndi gawo la GPS nthawi, nthawi ya khadi yowongolera imatha kukonzedwa munthawi yeniyeni kudzera pa ma sign a satellite.