I work at a BMW store and for our customers we charge for the nav. software. The update will not fix things like it saying stay right or turn here typically. The new nav. update would have more roads, address, intersections and etc... Like with BMW they don't make the nav. info a company call navtek does this and there the ones that are selling the update am sure its the same for ford. They will always have an update every year and sometimes 2 per year. Its completely optional update, if your having issues with the nav. saying your somewhere your not its not the nav software but the vehicle having issue. Hope this helps out.
Also if you can go to the nav. company website and they have a section where you can put feedback for missing address, intersection, streets or etc...