<p><i>UsbNmea</i> is an Android application that aims to offer some support to USB GNSS antennas on Android.</p><p>Currently, it only saves the messages that it gets from the antenna to a file on your phone. I have made another app to convert that file to a GPX (as long as the output from the antenna follows the NMEA standard), but I recommend using <a href='https://www.gpsbabel.org/' target='_blank' rel='nofollow noopener'>GpsBabel</a> on your laptop instead.</p><p><i>UsbNmea</i> starts a service that should stay on in the background, which gets the data from the USB antenna and saves it into a file. To get the data from the USB antenna, I use the <a href='https://github.com/felHR85/UsbSerial' target='_blank' rel='nofollow noopener'>UsbSerial library from Felipe Herranz</a>. Since his code is licensed under the MIT license, I decided to do the same for my code. If you like that, you can support him through the options he lists in the README of the UsbSerial library.</p>