How can I make an tracker node?

Neither do I.

I have played with trackers a lot. It is absolutly essential to be sure the GPS is providing valid data in the first place. That it the reason I posted this response earlier;

> And why my result does not work ???

You tell us.

When your code decides there is a new GPS fix\update and assigns the variables flat and flon from the GPS library what are these values ?

You are printing them out ?

You need to be sure the values you are getting from the GPS and sending are valid, before you need worry about what appears in the TTN console.

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