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IOS GPS tutorials
Basic Tutorial: http://www.icodeblog.com/2012/06/04/how-to-add-gps-to-your-ios-app-part-1/
Altitude Settings:
http://stackoverflow.com/questions/4870480/ios-corelocation-altitude
https://developer.apple.com/library/ios/Documentation/CoreLocation/Reference/CLLocation_Class/index.html
Altitude:
http://www.edumobile.org/iphone/iphone-programming-tutorials/how-to-measure-height-in-iphone/
With Phonegap:
http://docs.phonegap.com/en/1.2.0/phonegap_geolocation_geolocation.md.html
Smashing Phonegap
http://www.smashingmagazine.com/2014/02/11/four-ways-to-build-a-mobile-app-part3-phonegap/
AppGyver
http://www.appgyver.com/composer
phonegap
ios development