How do I track my airplane? I am a student of a flying school which has 10 Cessna-152's. Since all the aircraft are not equipped with a transponder, there is no way to track them. I am searching for a way to track them like Flightradar24 does with the maps. This is a project assigned for a bunch of students, so we are looking for an inexpensive but still good quality system.
You could try to get some cheap Car GPS trackers on aliExpress. But they would need to be in range of cell towers. Flying to high will cause connection loss.

A more expensive one, which I found to be working great is this one.

But you can get android based trackers for about 10\$US.