I always have GPS disabled, unless its more to do with where i live, GPS features of snapchat aren't worth using.
The infuriating thing i notice though is that since the android update was released where you no longer hold to view a picture or video, your phone will never go to sleep if snapchat is in the foreground.
That app literally sucks the juice out of your phone in 10 minutes.
Too much gps trying to load all their filters or something I don't know. I have to turn off cellular data when roaming or my phone will dead 20 minutes after I left the house.