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1.
The ability to direct and contribute to successful chat and banter, popularised by the standup/sketch video by The Unexpected Items.
"I can't believe he said that. Such stinky chat."

"Yeah, his chatnav must be well off."
by LASHMACHINE May 21, 2010
 
2.
Website where you can speak to people off Channel 4 reality tv program, Seven Days, and tell them what you think they should do next. Basically like Big Brother, but with facebook, twitter and Holy Moly in support online.
Did you see ChatNav last night? There were loads of comments on Dave's profile about him dumping Sarah.
by BigGarry September 20, 2010