Keyboard controls:
- H to toggle between showing all and only open spaces
- 1-9 to go forward in time by 1-9 hours
- R to go back to the current time
- C to center the map on your location
- D to change date
- [ and ] or Space to go back or forward by 1 day
- ← and → to go back or forward by 1 hour
- + and - to zoom in and out