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I always use the 'device only' setting and never have battery problems. But I only use positioning on when navigating in the car.
When 'high accuracy' it has to search for both cell towers and GPS, otherwise for GPS only. The latter takes longer when there is not a fix yet, but then is is just fast and accurate.
The so-called 'high accuracy' makes it easier for Google to track you, that is why they push it.
And when using Skysafari or Stellarium and there is not a fix yet in 'high accuracy' it sets the position to (0,0).
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