It needs to be done from the Apple Maps settings in your phone. It seems like Car Play has no software in the car, but only what is needed to mirror your IPhone. But someone needs to weigh in on this. Not my pay grade. Sure wish I could mirror Waze. Can anyone help with that?
How can I disable the voice when using navigation to and from a location?
If using the factory Nav, you CANNOT mute the volume. Its a feature the Manual describes, but doesn't work. I cant use my phone for AA or Carplay due to being a company phone, so I have to use factory NAV, and basically its impossible to have it co-exist with the Stereo, due to constant interrupts from the Nav system. Its been a known issue for some-time.
One of the growing list of annoyances I've noticed after living with my Touring model for a year. With Honda's reputation for a buttery smooth user experience, many directly driver facing features are annoying. It's like they overthought some things and didn't even bother considering others.