I just upgraded to the new version of the app Dark Sky (weather app). They added push notifications to alert you if it will be raining soon in your area. Anyway, when I turn on the push notifications I get the purple/white location arrow constantly at the top right of my screen. I'm concerned about battery life so I contacted the developer of the app. They responded saying there is a misconception about the solid location services arrow and it doesn't always mean the GPS is active. They said they only use cell tower triangulation, which uses much less battery than GPS. Is this true? I've always assumed that if I have a solid arrow that meant something was actively tracking my location and it will have a negative impact on the battery life.