Hello @PJaud-10967 ,
Thank you for asking your question in our community. There is no way to change the volume of the GO device itself. In these situations where you may have a driver hard of hearing or a very loud vehicle and you need these audible alerts in I would recommend using IOX-BUZZ
If you have any questions about this or anything else feel free to reach out. We are here to help.
Have a great day!
Eishi FUN