(Note: As with ANY gps based compass, you must be moving for direction of travel to be computed as it is based upon change in position coordinates.
ALSO: This obviously requires a GPS so this won't work on first generation iPhone or the iPod Touch.)
-Large easy to read numeric display of speed.
-Dual mode scale:
--Scale rotates with heading at the 12 o'clock position.
--Or, scale is "North up" with a heading arrow that rotates around the scale.
-US or Metric units dynamically selectable: Miles per hour, Kilometers per hour, Knots.
-Readout of current lat/lon in the lower left of the screen.
-Pulsing "star" confirms GPS update activity.
What's new in this version:
-Added compass scale mode to take advantage of the magnetic heading sensor in the 3GS. Still retains GPS direction mode as an option for difficult magnetic dash environments.
-Improved style of UI buttons