ChrisMartin
EF0
S&T can use data when you download construction updates, etc. but basic nav it doesn't really. GRLevel3 isn't a big data hog... more placefiles = more polling/usage. i wouldn't worry to much about grl3 though. big thing a lot of ppl mess up with on data usage w/ wireless stuff is forgetting to turn off things like auto update downloads. i have mine check & let me know, but make it ask before it downloads. another simple one some people just don't think about is itunes downloading podcasts. just look at what you have running all/most of the time & make sure it isn't downloading behind your back.