The GPS tractor needs power if it’s going to work for long periods of time.
It really wouldn’t take much to find one unless the person who installs it is very very determined that it not be found.
The vehicle I am in right now has one in it and it’s about the size of a cigarette light lighter.
The GPS tractor needs power if it’s going to work for long periods of time.
It will also depend on what type of Geo-tracker you are using.
If you want to know where your subject is in real time the tracker will have a transmitter so you have to place the tracker where it can get a signal out and that means it will be visible from some angle.
If you just want to know where he has been you plant a tracker that just records location and time then the tracker can be well hidden.
Not trying to go way OT, but if you’re a PI, LEO, or other type of investigator, you may not want or need to track for significant periods, so I just assumed you’d have something that could run on it’s own for days or weeks. With today’s technology, that doesn’t seem unreasonable.