I want to get the current location of iPhone from GPS and Cellular network. Is it possible to get the location from cellular network in iPhone. Please tell me any tutorial.
http://www.switchonthecode.com/tutorials/getting-your-location-in-an-iphone-application
The iPhone uses wifi access points, cellular towers and gps depending on what's available and provides the information more quickly. This all happens in the background using the Core Location framework which the tutorial above covers.
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Is it possible to use Core Location / GPS without any internet connection / disabled cellular network?
I need to know if my iOS device (iPhone, iPad, iPod touch) need internet to be upadted the current location or if the GPS will do standalone, I want to know because my iPad will not update the current location without any kind of internet, and I want to make sure if true or false, or probabbly bad GPS location or something.
Thanks, I'm just using CoreLocation without MKMapKit.
You are halve right about the iPad, all devices that have 3G or 4G support will also have a full GPS receiver. Thus they do not an active internet connection to get a location.
On the other hand if your device has an active internet connection ti will able to give you a location quicker with triangulation of wifi and cell tower information.
You will first receive this location while the device tries to get a more accurate location via GPS.
I was in Scotland with a Canadian phone recently, and to avoid roaming charges I had my cellular data turned off throughout the trip. However, the pictures I took still had accurate geotags, meaning my location was still available to my camera apps (even though I couldn't actually see these locations on a map until I got home).
My question is: how would I go about retrieving location data in a situation like that, where I can't actually display a map because there is no internet connection? And, just to improve my understanding, how is the location actually being retrieved? If "cellular data" is off, is GPS still available, or can the location only be calculated using nearby wi-fi hotspots at that point? And finally, if both cellular data AND wi-fi is turned off on a device, can location still be retrieved (i.e. is GPS still active)?
Any info on the subject is welcome - all I am trying to do is handle all possible situations created by the presence or lack of location services and an internet connection in an app where I (if possible) display and store the user's location.
Thanks!
iOS devices that have actual GPS hardware in them can give accurate location data even if there is no WiFi or cellular.
Of course, most map apps require an Internet connection to display a map. But if you have a map app with local map data, then you would be able to see the map with your position even without any Internet connection.
On devices with an actual GPS, location services works just fine with no Internet. It may take a little longer to zero in on your position but it still works normally. Of course on iOS devices with no real GPS, you do need a cellular or WiFi signal to get any position data.
Currently I'm doing an location app in iPhone but my question is....
What is the service does iPhone using?
According to Apple Developer Manual
"The framework uses information obtained from the built-in cellular, Wi-Fi, or GPS hardware to triangulate a location fix for the device."
So it will be either built-in cellular, WiFi or GPS hardware, how am I ensure that it always uses GPS hardware to get the location?
Because my app requires accurate location.
To limit the supported devices to the ones with GPS you can use the UIRequiredDeviceCapabilities in your app's plist. The only way (to my knowledge) to force the device using the most precise location determination (in this case GPS) is to set the desiredAccuracy and distanceFilter of CLLocationManager accordingly.
from what i read i understand that iPhone can determine your location using Wi-Fi. If you're not in range of any Wi-Fi, iPhone can determine your location using cellular towers.
I am currently develop app that use the GPS so my question is when there is no GPS signal (like in buildings)does the location services try automatic to determine the position through Wifi or cellular towers OR i need to do somthing manualy in the code??
if it does automatic does it return a GPS format(latitude, longtitude) or somthing else?
thanks so much.
It will return a position as always, but with reduced accuracy.
I guess the GPS chip is only there on the iPhone. But for some reason, my iPod Touch seems to know my position anyways even without GPS chip. So what does that mean for Core Location? What do I have to consider when using Core Location both on the iPhone and iPod Touch? What are the differences?
I believe the API is the same. All that differs is the accuracy of the location that gets returned to you via the API.
the iPhone uses the GPS to get a pretty accurate lock on your location, whereas the iPod Touch uses IP-Location or Wifi-Triangulation technology, which is less accurate than the iPhone's GPS.
The iPod touch uses this method for Core Location information
http://en.wikipedia.org/wiki/Skyhook_Wireless
-t
The iPhone uses a technology called A-GPS (the A stands for "assisted"), whereby the the cellular network and WiFi networks assist the GPS chip in determining your location. Depending on your location, this might result in a more accurate triangulation of your position.
While the iPod touch can't use GPS satellites or cellular towers to determine your location, it can use WiFi, so thats how your iPod touch knows where you are.
As far as the CoreLocation APIs go, there shouldn't be a difference between the devices, however accuracy will probably be lower and less consistent on the iPod Touch.