Quote from: "Gammalerik"I read somewhere that external bluetooth GPS receivers save quite some battery when navigating on a smartphone. How much battery-saving do we we speak of here? I own a SGS2.I measured long ago that running a GPS on a previous phone was around the 80-90mAh mark, where bluetooth is nearly negligible. So the battery savings is good, but what's even better is having an accurate and reliable GPS. Built-in GPSes suck. They have poor accuracy, poor sensitivity, and are often very slow to warm up.