Danny, this is new to me.
Off-road navigation like in 4x4?
IGO? :O
Are you sure and where did you "heard" it?
The last official rumor I heard was NavnGO would only further develop Primo and halt the development on all iGO/Amigo/iPhone/Android navigation. Since then (when I learned), nothing much really happened on the NavnGO "front line".
Can you give any more info?