does having the my location on for my weather updates drain the battery?

[cbreze]

I didn't think it used the gps either until yesterday when I was at a meeting and the east side of a four lane road was one city and the west side was another. The road being the city border. Well when I crossed the street the weather changed cities. Also if you untick the option in phone settings to enable the gps it messes with the weather by never updating. So from this I conclude it def uses gps to figure weather location.
Side note: on my tp2 the power usage for leaving the weather location on seems no diff than off.