The NAVI lockout happens at 5mph and above.
One simple way around this lockout is to pre-enter the destinations as waypoints or something like that (haven't tried that myself).
The lockout only prevents more complex operations such as entering addresses...
Another hack is to install a lockout defeat switch.
Some kit may be available for CX9 already (haven't checked for a while).
It basically fools the NAVI into believing that the vehicle is running at <5mph when switched on. Once entry is done, switch it off again.
There are vendors who sell such kits
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www.coastaletech.com
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www.prestigioussociety.com
for Toyota/Lexus.
The latter was looking for a test vehicle for implementing a kit for CX9.
If you are in LA area, you could be the one. You are welcome to contact them.
Just FYI. (not endorsing either of them)
P.S. CX9 uses NAVI from Denso, who also supplies Toyota/Lexus their NAVI systems.