You may navigate between objects of one class to objects of another class in an association. Unless otherwise specified, navigation across an association is bidirectional. You may also specify that navigation is limited to one direction. You may also choose to display arrowheads on the association to show the navigation.
Specifying direction of navigation
By default, an association is navigable in all directions. To specify which end of the Association is navigable, do this:
1 Double‑click the association.
2 Select or clear Navigable for each association end. Its default setting is On.
Displaying arrowheads
1 Open Diagram Properties (select Edit, Diagram Properties, or right-click on the diagram workspace, and then click Diagram Properties).
2 Set Navigation Presentation Mode to one of these values.
All Arrows: Arrowheads showing bidirectional associations and unidirectional associations are shown.
No Arrows: No arrowheads are displayed.
No Bidirectional Arrows: Only arrowheads specifying unidirectional associations are displayed.