I hook mine on the strap that you flip together across your chest between the shoulder straps. I don't use an ear piece but with the radio right there I can keep the volume very low and still hear it. I can also just tip it up to look at the map without having to take it off either.
I do the same.
Hints...
Forget the head set. Use text message to contact and than adjust volume as needed.
Lock screen or changes when walking.
Re calibrate after you change batteries.
Get the AA battery pack.
Put a screen saver on it.
I wrapped the Antena with reflective tape for easy find in the dark.
Put a address label on the battery pack in case you loose it.