hook_menu() item never reached?
I think I see your problem

hook_menu is for defining your own page paths in code. It's not for hooking into the processing of a page that already exists. So you've got a conflict where you have 2 pages with the same url and the latter (the node/view page or whatever is it with the same url) is taking precedence over your bizaudit_menu definition. So your code created path is never triggered as Drupal has found another route for your "apim/navigate" path