Global topnavigation at buddypress/wp-multisite

We are developing a buddypress/wp-multisite for educational network. One of our goals is to make a good user experience, by a simple navigation at the entire site.

We want a sitewide navigation on both buddypress and wpmu. The navigation must contain user directory, groups directory, blogs directory, my profile and the howdy-menu. Do you know any plugins that solve this issue? Or is there another solution?