# MicroNav USBL GPS on a BR2

**URL:** <https://discuss.bluerobotics.com/t/micronav-usbl-gps-on-a-br2/8799>\
**Category:** QGroundControl\
**Tags:** positioning\
**Created:** [December 28, 2020, 7:54pm UTC](https://discuss.bluerobotics.com/t/micronav-usbl-gps-on-a-br2/8799 "2020-12-28T19:54:53Z")\
**Posts on this page:** 1\
**Showing post:** 66

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**Author:** ![Mac1](https://avatars.discourse-cdn.com/v4/letter/m/848f3c/32.png) [@Mac1](https://discuss.bluerobotics.com/u/Mac1)\
**Post date:** [January 8, 2021, 12:56pm UTC](https://discuss.bluerobotics.com/t/micronav-usbl-gps-on-a-br2/8799/66 "2021-01-08T12:56:30Z")

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it turned out that it was a check sum issue , Willian managed sorted the program out , it was a problem with the Tritech genesis program

Willian contacted Tritech and they updated the program,

Reply from Tritech :  
The coding in Genesis skips the first character in the checksum generation but the string being sent to the function has the $ already removed.

Thank you for making us aware of this and a fix has already been implemented. This fix will definitely be rolled out in V1.7 of Genesis

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