factory sat nav no speed reading and reverse camera hookup

Hi all just picked up my new to me 2012 LWB trafic and it has factory sat nav



I have 2 questions

First can I connect a reversing camera to the satnav screen its a factory tom tom unit I think its called a carminat



Second question is it possible to have the speed come up on the sat nav like in my portable sat nav



I drive 4800K,s a month most of these K,s one go and like to do the speed limit everywhere



I had read on the tom tom forum about this question but no one seems to answer that question on that forum so thought it a waste of time to register to get no answer