iCompass Surveying is the software for compass surveying on the iPhone 3GS.
All you need for compass surveying is a iPhone 3GS that installed iCompass Surveying, and a friend (or the stick) whose height you know.
If you have any questions and requests, please send E-mail to this address.
Email Address: iHypsometer"replace here to at mark"taakkumn.com
(Replace "replace here to at mark" to @.)
And check this Web site.