3GPS OS 3.0 combined altitude, speed, direction and mapping in an early iPhone utility. The archived September 16, 2009 listing identifies NTS New Technology Systems GmbH, the smadget.com site and App Store ID 325643669.
The “OS 3.0” name belongs to that historical product. It does not mean this is a current iOS release or establish that the old app works on modern devices.
Similar numbers can describe different things
The archived description included altitude and speed graphs, a map and a compass-style display. It distinguished the iPhone 3G’s movement-dependent course reading from the iPhone 3GS’s ability to show a heading while stationary.
That distinction helps a reader ask the right question. The direction in which a device points and the direction in which its position changes are related ideas, but they are not interchangeable. An interface should make clear which one a displayed value represents.
Read a measurement with its situation
For any outdoor data display, first check the unit and the moment represented. A graph of earlier movement, the latest sample and an average over a period can produce different values without one necessarily contradicting the others.
A useful comparison keeps those conditions consistent. Record whether you were stationary or moving and which screen supplied the number. If the app presents a trend, inspect the whole interval rather than picking the most dramatic point.
Keep the historical feature list narrow
The original promotion made broad claims about the app’s usefulness outdoors and mentioned an altitude calculation using additional data. It did not provide enough technical evidence to establish a universal accuracy figure, so none is supplied here.
This page also does not turn the historical app into a navigation recommendation for a particular journey. Its value is as a record of how early iPhone utilities brought several movement-related displays together, and of why those displays remain easier to interpret when their meanings are clearly separated.