Have Honda Questions? Ask a Honda Repair Expert.
Hello, I will try to help you with your question. First the "upgrade" to factory navi would be expensive and would not be practical. first the cost of the parts would be high but also the labor to install would be high. the factory harness would need to be changed and basically the entire van would need to be taken apart.
the more practical way would be to invest in a high quality after market unit.
let me know if you have any more questions