The following methods and solutions could be helpful for realising a business process model navigation:
HOTSPOTs, PROGRAMM CALLs and INTERREFFs
http://www.adoxx.org/live/adoxx-notation-language-graphrep
BAR DISPLAY MODEL TYPE solutionhttp://www.adoxx.org/live/faq/-/message_boards/message/87115WATERMARKS solutionhttp://www.adoxx.org/live/faq/-/message_boards/message/87216