How do I track a GPS device that has no connectivity with an internet or cellular network?

Are there any GPS devices that can be tracked in real-time WITHOUT the use of a SIM card ? Or is there any possibility to track a GPS device which has lost the network signal ? Assuming they can both send and receive sms and mine has internet connection ? Something like every minute it checks, not need for a real time hard track but as good to know where to find her if she gets attacked. I want to develop an app for it