Currently, the Android App is working in an unsatisfying way:

In the Settings menu, under Sound, I've enabled the option to play sounds using the phone's speaker.
When I plug in my earphones in my phone (a Samsung Galaxy S6) I expect all sound to be diverted to the earphones, not being played in the public speaker.

Waze does not behave like this. It plays the sound in the speaker regardless of the cable.

My request is to let the user configure, in detail, where the sound should go.

Output sound to:
[ ] Speaker/headphones
( ) Speaker OR headphones
( ) Speaker AND headphones
[ ] Bluetooth

There is a checkbox for the title-option "Speaker/headphones". As long as this is unchecked, the two radio buttons below is grayed-out. When you check it, you can choose one of the two alternatives, where "Speaker OR headphones" should be the default.

Selecting "Speaker AND headphones" will output the sound both ways even though the audio cable is connected, while "Speaker OR headphones" work the intuitive way, i.e. no speaker when an audio cable is plugged in.

If the checkbox for Bluetooth is checked, sound goes to Bluetooth as well.

I've posted this in the forum as well. I don't understand why there are two separate places for suggestions/requests... :
https://www.waze.com/forum/viewtopic.php?f=657&t=161439&p=1224241#p1224241