Boom navi voice prompts
Maybe I have missed what your are looking for but I have the 6.5 boom system and my navi does not prompt for anything unless I have an active route. If you are getting navi directions when starting up your bike, from the navi route screen on the right side about midway highlight the small stack of lines. When clicking on the stack, it will give the option of canceling the route. Hope this helps, or I have missed what the issue is and sorry about that.
2020 FLTRXS, Vivid Black, KW Slicer Front Fender, Sundowner Seat/Modified by Mean City Cycle for trips, Mustang Wide Tripper Solo Seat