I am more surprised at the concept of something the size of aircraft carrier being expected to have some level of location privacy. I would think the general area of the world it's operating at could be deduced easily from its last port of call and other things, a cheap amateur home-made radar can have a general idea within a few sq-km resolution by pinging from any littoral up to a few hundred km. I would also have thought, anyone that would care about targeting an aircraft carrier that's at a greater distance away from a coast would also have access to satellite imagery and high-altitude UAV.

I have seen more concerning things being revealed like locations of secret bases, and even internal building maps by looking at troops' WiFi. but those are secret places.