navigami

Landmark is a named location. Landmarks can be collected in categories.

Actions:
- Select : edit landmark

Commands:
- New Landmark : add new landmark
- New Category : add new category. Subcategories are not allowed.
- Delete : delete landmark
- Set Target : select landmark as target
- Map : show selected landmark on map
- Navigate : show the Navigation Screen. Target must be selected
- Back : back to navigation menu