iPhone GPS/ GeoTags??

[MikeFatale]

Just a quick question! I saved some photos from the internet the other day and then edited them with a cut and paste app and then posted them to Instagram. The GeoTags on those photos (both in photos and on Instagram) had me about a mile down the road from where I really was. Usually this isn't the case and the GeoTags are spot on. Ultimately this got me in trouble at home (lol) because I couldn't explain what was going on with the GeoTags. I was sitting in my car. So my question is, is it possible for the GeoTags to be off sometimes? Is it based on cell service? What could have caused this when every other time I'm in the same location it gets the location right? She said it's impossible for the tags to be off. I showed her where Facebook and Maps were off on gps once or twice but was told that's different. Idk. Any help is appreciated !