After setting up several navigation routes using my watch, I've noticed an odd behavior. If I set up the route using Siri through my watch with my iPhone locked, I get turn by turn and haptic notifications on the watch but not audio guidance through my iPhone. However, if I unlock my iPhone during the route, or initially set up the route on my iPhone, I get both notifications on my watch as well as voice guidance through my iPhone. The other odd thing is that I generally keep the voice level set to "Normal Volume" in the maps program options, however when this behavior occurs, it sets the audio level to "No Voice". I can't imagine this is by design as it seems much safer to have both audio as well as visual/haptic alerts...