You are reading a single comment by @Greenbank and its replies.
Click here to read the full conversation.
-
It's different circuits though ain't it, so it's effectively running two GPS circuits (maybe).
The biggest extra draw will be that more satellite locks = more processing required in determining the (more accurate) position.
Whilst you need a minimum of 4 satellites for to work out your position (in 3D) any extra satellites will help refine this but add to the burden on the GPS chip, which means more power required. Enabling GLONASS will effectively double the number of satellites available which leads to a noticeable decrease in battery life.
Greenbank
It's different circuits though ain't it, so it's effectively running two GPS circuits (maybe). I still say it's the screen that chews the juice.