How to collect GPS coordinates?

Question

satellite navigation

Hello.
They gave the task: to collect the coordinates of disparate objects.
The objects themselves are from 2m^2 to 10m^2. The accuracy of the coordinates is about 2-4 meters.
Mobile phones give out a maximum of 6 meters (android, unknown gps module).
There is a budget of 15,000 rubles.
What can be used from ready-made devices, amplification circuits (device + antenna, for example) or software (comparison of several points)?
I will be glad to any ideas and opinions.

Answer 1

If there is food at the objects, then use "Teltonika", "Ruptela" + Wialon (for example)

Answer 2

Here on the map look for the objects you need mapszoom.com/ru/gps-coordinates.php
click and find out the geographical coordinates of this place !