iPhone Compass GPS Direction

by

There is a standard “heading” or “bearing” equation that you can use – if you are at lat1,lon1, and the point you are interested in is at lat2,lon2, then the equation is:

heading = atan2( sin(lon2-lon1)*cos(lat2), cos(lat1)*sin(lat2) - sin(lat1)*cos(lat2)*cos(lon2-lon1))

This gives you a bearing in radians, which you can convert to degrees by multiplying by 180/π. The value is then between -180 and 180 degrees, so to get a standard compass bearing add 360 to any negative answers.

atan2 is a standard function related to arctan, that does the right thing for the four possible quadrants that your destination point could be in compared to where you are.

More Related Contents:

  1. Iphone – Remotly Turn Off Air Plane Mode [closed]
  2. iPhone – Backgrounding to poll for events
  3. UIImagePickerController and extracting EXIF data from existing photos
  4. Calculate new coordinate x meters and y degree away from one coordinate
  5. iOS: Movement Precision in 3D Space
  6. Calculate distance between two place using latitude-longitude in gmap for iPhone [duplicate]
  7. GPS coordinates in degrees to calculate distances
  8. iOS background application network access
  9. How to rotate a Direction Arrow to particular location
  10. Is it possible to get the atomic clock timestamp from the iphone GPS?
  11. CADisplayLink OpenGL rendering breaks UIScrollView behaviour
  12. How to make an progress bar for an NSURLConnection when downloading a file?
  13. iPhone – Get Position of UIView within entire UIWindow
  14. Horizontal UITableView
  15. iTunes Connect Screenshots Sizes for all iOS (iPhone/iPad/Apple Watch) devices
  16. CSS submit button weird rendering on iPad/iPhone
  17. How can I encrypt CoreData contents on an iPhone
  18. Font size in pixels
  19. How can you apply distortions to a UIImage using OpenGL ES?
  20. Prevent automatic popToRootViewController on double-tap of UITabBarController
  21. How to post more parameters with image upload code in iOS?
  22. Receive message “A signed resource has been added, modified, or deleted” when trying to debug an App on iPhone
  23. List saved files in iOS documents directory in a UITableView?
  24. UIImage imageNamed requires pathForResource?
  25. UIDatePicker, setting maximum and minimum dates based on todays date
  26. how to hide navigationbar when i push from navigation controller?
  27. How to disable the edit button that appears in the more section of a UITabBarController?
  28. How can I detect whether the iphone has been rebooted since last time app started
  29. Cleaning up the iPhone simulator
  30. How to animate application icon in iOS?

Leave a Comment