My current idea is as follows:
- Always show a dot indicating the location at the time during replay, hide current location icon.
- Show trail in the past as solid lines, show trail in the future as shaded lines. (imagine google map navigation, alternative route is shown in shaded lines)
- There could be a "tail" following the "dot", the color could be the color of the trail plus white so it is highlighted, the closer it is to the "dot", the more highlighted it is.
My current idea is as follows: