Things to do for completing this app

- satellite
  - implement update for TLE files
  - adjust stored trajectory data if TLE file is updated

- all forms
  - check value sanity with javascript
    - matching passwords
    - enable submit/login buttion only if mandatory values are filled in
      
- user
  - change profile data (password)
  - add new location
  - modify existing location (?)

- submission
  - make a form
  - store the data

- data display
  - make a page
  - create ranking view
  - make list of latest submissions
  - display submission on map