Nav. Hack.
Find the Vehicle Speed Sensing wire going to your nav. unit. I believed it's a White/Red wire (alwyas double check your wiring

). Cut the wire and out a simple on/off switch in-line. Turn the switch to cut circuit, now the "passenger" can input data. Once data is input, turn the switch to close the circuit. If you leave the circuit open, the nav. will not display right since it does not get a speed sensing signal messing up it's reading.
This link will give you an idea, it's for an Infinity but same concept.
http://www.infinitifx.org/phpBB2/viewtopic.php?t=39&
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Titan/Armada Part Numbers

AEM intake, Banks exhaust, Up Rev tuned. Detroit Truetrac
305.5 WHP, 370.4 ft/lbs tq