# Muplex use and config

**URL:** <https://discuss.bluerobotics.com/t/muplex-use-and-config/10228>\
**Category:** QGroundControl\
**Created:** [July 21, 2021, 8:05am UTC](https://discuss.bluerobotics.com/t/muplex-use-and-config/10228 "2021-07-21T08:05:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![saude](https://avatars.discourse-cdn.com/v4/letter/s/db5fbb/32.png) [@saude](https://discuss.bluerobotics.com/u/saude)\
**Post date:** [July 21, 2021, 8:05am UTC](https://discuss.bluerobotics.com/t/muplex-use-and-config/10228/1 "2021-07-21T08:05:30Z")

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Hi all, anyone knows how to use and config Muplex program ([Marinux Website](https://marinux.tuxfamily.org/#MUPLEX)) on Ubuntu? I need to receive a GGA string from an external USBL via USB-Serial converter and visualize the coordinates on QGC. Thanks.

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**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\
**Post date:** [July 22, 2021, 7:20am UTC](https://discuss.bluerobotics.com/t/muplex-use-and-config/10228/2 "2021-07-22T07:20:08Z")

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Hi @saude, welcome to the forum 🙂

I haven’t used Muplex before, but have you tried checking if QGC can connect directly to your USBL via the USB-Serial converter? I’d suggest you see if it appears as an option in QGC’s NMEA GPS Device dropdown when it’s plugged in:

 ![QGC NMEA GPS Device Dropdown](https://us1.discourse-cdn.com/flex019/uploads/bluerobotics/original/2X/f/f5c5f8f236971aa9ebed9582cc3ec37235dcc473.png)