Tracking your own position via SMS?

Question

SMS

A service is required that builds tracking of its own movement (ideally, a Google map with points is the output).
Previously, I did this, but then the gps navigator itself sent the data. This time there will be a navigator, but it will not be able to send data to the Internet.
The ideal option would be to send an SMS with your own coordinates.
Is there something similar?

Answer 1

I think you can try to do it yourself.
For example, you can take the microcontroller of the AtMega series, for example, AtMega16, screw a gps receiver and an old phone to it.
Here is an example of connecting a phone to a microcontroller:
radioded.ru/content/view/67/1/
But connecting a gps receiver:
procoder.info/index.php/articles/12/179-gps-connect

Answer 2

There are matching bases of cellid and coordinates.
As a result, you can get these cellids with the software, and then punch the coordinates through the base. And then there is the fantasy of how to implement it.
You can send a sms cellid if there is no Internet on the gsm transmitter, and so on.