iPhone has GPS, and iPad 3G model has Assisted GPS. What's the difference between the two? Which is better? Do I need to buy GPS receiver if I want to get real GPS data?
IPhone – What’s the difference between iPad’s a-GPS and iPhone’s GPS
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There's no difference besides the storage capacity.
As the iPhone does not have an option to extend the memory after purchase, you have to choose the right amount of storage right from the beginning.
You can always manage how much space you use by manually choosing which data to sync (music, photos, movies, apps).
Generally more available space gives you the freedom of not having to manage your sync settings too much.
- 16GB should be fine for most people, especially if they are willing to make compromises regarding sync settings.
- 32GB is good if your like to take lots of photos or have a large music library.
- 64GB is good if you record HD movies which increase in size very quickly the longer you record.
I regularly experienced similar problems with RunKeeper on my iPhone 4S where distance was over-measured. When reviewing the plotted map of my run I could see the coordinates jumping a bit erratically from one point to the other, accounting for the extra distance, and this for entire outdoor runs, not just sporadicly on spots with bad GPS reception.
Normal run:
Bugged run:
While I cannot give a definitive answer as to why this problem occurs, and why the iPhone seems to get stuck in this bugged state when it does, completely rebooting the iPhone (and possibly additionally toggling Flight Mode to reboot the antennas as well) seemed to always resolve it for a few days or even weeks.
On a sidenote, since I upgraded to my iPhone5 (with iOS 6 ofcourse), the problem has not presented itself again so far. Perhaps the problem was fixed in either iOS or in the hardware meanwhile.
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Best Answer
The iPhone also has Assisted GPS. The iPhone page you pointed to only has abbreviated versions of the features; when you check the actual "specs" pages for both devices you get the same info.
Both get real GPS data (assuming one of the 3G versions of the iPad, the wifi-only versions have no GPS). The "assisted" part just means that it also uses cell tower locations and wifi networks it can detect to help narrow down your location, usually much faster than it can get a full GPS lock from the satellite signals.
In real-world experience they both work well, but both have fairly small GPS antennas. If you want really solid turn-by-turn directions while driving, an external GPS antenna is definitely helpful. Tom-Tom makes a pretty sweet combination mount, charger, and boosted GPS antenna.