I just installed the "GM Lock Pick Gen 6" in the H2. This allows you to activate the navigation destination entry and also the DVD screen while moving.
The only downside is that it reverts to the restricted operation whenever the vehicle is placed in Park or turned off.
If I recal correctly, on the H2 you can also find the vehicle speed sensore wire and install a togle switch, this will trick the system into thinking you are not moving and allow your passenger to work the Nav system while in motion.
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