GPS tracker GT003 is sending incorrect coordinates. What is the reason and what can be done about it?

Question

satellite navigation

I organized a server for receiving data from a bunch of different GPS trackers. Some of them, like the A10 models, send correct coordinates, and some, in particular GT003, which is important to me, send coordinates with a huge deviation, hundreds of kilometers from the actual point.
Maybe someone has come across something similar or understands trackers: how are such situations solved?
Simply subtracting the difference between the transmitted coordinates and the real ones does not help, since some arcuate deviation is still growing, apparently a more abrupt mathematical formula is needed to solve the problem in this way. Has anyone had to screw such crutches?
I didn’t find official technical support for these trackers, there’s nothing in Google either in the Russian or in the English sections, so I don’t know where to turn anymore. Any kick to the article or manual is also welcome.

Answer 1

> send coordinates with a huge deviation, hundreds of kilometers from the actual point.
so the protocol may be different, parsing is not configured.

Answer 2

the same tracker. The same problem. The deviation is about 35 kilometers in a straight line.
Did you manage to solve the problem?