I use Navigator on my Android phone when going hiking. I have found that with Navigator running, the phone battery is drained rather quickly even if the screen is off. I suspect that Navigator is calculating location information, and perhaps the screen image data, on a rapid basis (at the same rate as in automobile mode?). High CPU usage is not a problem for a vehicle or even a bicycle since an external battery is can be readily available and is easy to carry. Not the case when in pedestrian mode. When one is walking, rapid updating of data is not needed as one will not move very far over a period of even a few seconds while walking. Reducing update rates would lower CPU usage and should extend battery life.
Option in a menu to set the update rate to a lower value for pedestrian mode?
Option to turn off screen updating when in pedestrian mode and the screen is dark?