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We've got an internal proposal to change our top level nav depending on the section of the site. For example, on our homepage it might read: Products, Library, About with relevant links dropping down below. As we have varied products, the drop down underneath it would include the various families. When arriving on the product family page the top-level nav would change to represent more specific offerings. For example: xxx.com 1. Products; 2. Library; 3. About xxx.com/xxx 1. Product family 1; 2. Product family 2; 3. Product family 3; 4. Library; 5. About What are the SEO/UX implications of this? It seems confusing but allows more specific navigation via the main nav depending on the section of the site. Also it seems that an alternating TLN might not be too Google-friendly.