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TODO: Design in gory detail with screenshots 
Overall, decided to focus on presentation of the timeline. The view and edit functions are functional, but we have not innovated in that area.
Decided to disable selection of the map markers - it's awkward with a touch screen when there are many markers, and the arrow obscures them partially.
We made the following design changes in response to user feedback:
Map/Journal view mode:
- make map interactive.
- changed the positioning of the map icons so that they mark the point in the middle, not below.
- create an direct mapping between entries in the list and entries on the map
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