GPS without a data plan

Discussion in 'iPhone Tips, Help and Troubleshooting' started by profinite, Jun 16, 2009.

  1. profinite macrumors member

    Joined:
    May 1, 2009
    #1
    Until recently, I had thought that I had to have a data connection in order for programs on my iPhone 3G to work that utilize GPS.

    While I was in Tokyo in May, I had a SoftBank 3G SIM without a data plan in my jailbroken and unlocked AT&T iPhone 3G. As I walked around in Tokyo, I assumed that programs such as Maps would not work.

    Then, while I was near a big train station such as Shibuya or Shinjuku, I discovered by accident that the "Locate Me" button in a map program worked. That is, a familiar pulsing blue dot would indeed locate me on the map. This phenomenon happened repeatedly.

    Just to be doubly certain that my iPhone did not have any data connection, I went into Settings > Usage and looked at Cellular Network Data. Both Sent and Received showed 0MB at all times.

    Recently, I read somewhere that the iPhone would use a data connection to assist GPS when GPS signals are weak or for the purposing of speeding up location acquisition.

    Therefore, am I correct that, in theory, GPS on the iPhone would locate me on a map wherever I am on earth as long as the iPhone can receive a clear GPS satellite signal?
     
  2. dukebound85 macrumors P6

    dukebound85

    Joined:
    Jul 17, 2005
    Location:
    5045 feet above sea level
    #2
    the maps are obtained from data

    soooo unless you had preloaded maps, blinking dot doesnt do much good
     
  3. profinite thread starter macrumors member

    Joined:
    May 1, 2009
    #3
    Yes, I did have a pre-loaded map on my iPhone 3G.
    Now, what does the pulsing and moving blue dot mean in this scenario?
    Was I really getting the blue dot from GPS signal?
     

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