I saw this [on CNN today][1].

>For months, US intelligence and military personnel in Iraq have been raising alarms about the risk to American forces from these newer, more sophisticated Iranian-made drones. Rather than being guided by a pilot from a remote location, some of these ***small, fixed-wing drones use GPS navigation, making them far less visible to US surveillance systems and impervious to jamming***. 

I understand how an independent guidance system is probably jam-proof, but how  does using GPS make the drones less visible? Don't all military drones rely on  GPS?


  [1]: https://us.cnn.com/2021/06/28/politics/us-airstrikes-new-iran-drone-attacks-avoid-surveillance/index.html