Step 1 - Take large hammer and put it through the satnav screen
Step 2 - Remove center console
Step 3 - Remove Bose radio
Step 4 - Install decent Pioneer/Alpine/App Radio (delete as applicable) with quality postcode satnav
Step 5 - Replace center console
Step 6 - Start car, turn on new radio/satnav, press "Destination" type in postcode
Step 7 - Drive happily to your destination while enjoying the much better sound quality of new HU
Step 8 - Realize you should have done it ages ago!
Hope it Helps