The problem I have is on long trips (via bicycle or on foot) my phoneâs battery hits 15% remaining and screen dims mid-trip, which is essentially blank in daylight when navigating. Iâm in airplane mode with wifi also disabled. So the only power consumers are the screen and the GPS receiver. Yet Iâm still forced to power down, swap batteries, lose the clock time (which GPS strangely fails to correct), and wait to reacquire a GPS signal. Then OSMand remembers the route parameters but forgets the route (a bug). And because the phoneâs time is 1am, I have to either update the time or force OSMand into daytime mode.