Re: Can't hear 430n Nav instructions
I came across your post while looking for a different "volume" issue. I realize your post is almost a year old, but I didn't see an answer to your issue / problem. If it's still an issue, here's my response...
The volume knob adjusts the volume for the device you're listening to. When listening to the radio, notice the volume number. Let's say it's 12. When the GPS directions are being given, you'll see the volume number changed to something like 4. While the directions are being given, turn up the volume to 15. The GPS will remember volume 15. And the radio will stay at 12. Same thing with bluetooth cell phone. Turn up the volume control for that too. Your system will remember the numbers for the devices.