Is it possible to set the GPS module L80-M39 to output the GPS data in binary format?
From what I have found on internet this module is using MTK3339 and this one supports binary data output.
See link Binary Protocol
In the file GNSS_Flash_EPO_Application_Note I have found
//It is recommended to explicitly specify a baudrate when changing UART packet protocol, for example,
$PMTK253,1,115200*00
But this one is referring to EPO data transfer procedure.