How do I plan a route with buddies?

Invitations go out with a plan, so a route's buddies are its plan's buddies. In the route's Details, tap Invite Buddies. If the route already belongs to one of the day's one-time plans, the row opens to your buddies: tap one to invite them to that plan right away, and tap them again to take them off, which cancels their invitation. If the route doesn't have a plan yet, Invite Buddies opens a new plan filled in from the route's day, start time, and starting place; choose who to invite there and save, and the route then belongs to that plan. Buddies get the plan's date, time, title, location, and note, plus any changes you make to the plan, and they can say whether they're going; their answers show in Details. They don't get the route's stops, order, or notes. You can also start from the plan: choose Plan Route in its menu to plan the day around it. Plans that follow a buddy's invitation are invited to by their organizer, and recurring plans can't carry invitations, so Invite Buddies doesn't show for them. Buddies must be set up first: with no buddies yet, Invite Buddies opens Buddies.