Compatible with iOS 5, 6, 7 and 8
If you need iOS 4.x version TryGpsOut
TryGpsOut can transmit Iphone's GPS data to external Bluetooth device (for example; iPad with BTstack GPS installed). You can view GPS data on the second device.
and it can not run background .If you exit the trygpsout5 , it can not transmit Iphone's GPS data to external Bluetooth device. When using trygpsout5.com , you can press the power button for saving power.
See all the Screenshots below