Yes, GPS + Glonass use more power, like 20% more over using just GPS, and that is all the time.
In my case activating Glonass does not result in better positioning precission, so I ended disabling it and enjoying longer battery life. YMMV. I read somewhere that Glonass works better in northern latitudes (like the ones where Russia is) so maybe where you live at it gives better results.
Using the addition of Glonass will consume more battery for the simple fact that your device is now using another feature to acquire more satellites. How much battery I don't know, but there are too many factors that affect GPS only or GPS+Glonass to assign a percentage. For example, your watch will work harder (more battery consumption) trying to acquire satellites depending on time of day and how many satellites are in view, if there's bad weather or cloud cover, if you have dense overhead vegetation or nearby buildings regardless if you are using GPS only or GPS+Glonass. Glonass seems to help more while near buildings, but because of the factors I mentioned earlier, so there is no way of knowing how much more power is being used.
Well, I disagree. It can be measured, and a percentage can be calculalted from measurements. It won't be 100% accurate in the 100% of cases, but it would give some insight. In my case activating Glonass consumes roughly 20% more than only with GPS. Your Mileage May Vary.
Well, I disagree. It can be measured, and a percentage can be calculalted from measurements. It won't be 100% accurate in the 100% of cases, but it would give some insight. In my case activating Glonass consumes roughly 20% more than only with GPS. Your Mileage May Vary.
You disagree based on what? GPS and/or Glonass consume more battery power acquiring satellites. (see why in link below). You need a minimum of 3 satellites (4 for 3d dimensions preferably with 1 overhead) for a GPS or Glonass fix. Depending on the time of day and where the satellites currently are, you may get those 4 Glonass satellites no problem. Later in the day at the same location you may have difficulty acquiring a 4th, so Glonass will use more power trying to do so. Are you saying that in both circumstances that Glonass will use 20% more battery then GPS regardless of how many satellites each has acquired?
I was disagreeing just with the "there is no way of knowing how much more power is being used" part. It is empirically measurable, at least over a period of time (i.e how much battery life you have with only GPS vs GPS + GLONASS), and from that measurements a percentage can be easily calculated.
