Just use a phone for nav purposes.
Thats what I've been doing for now.
But in my last rig I had a Pioneer AVIC-8200NEX w/ nav and that radio was SOO nice, I would love to have one in my Armada!
08 Armada 4x4 SE K11 Smoke Grey
Bully Dog GT w/ 2* Timing Mod, Airbox Mod, Belltech Sway Bar w/ Poly Bushings Front + Rear,
Running Board Delete, Tinted Headlights + Taillights, Alpine Type S 10" Sub + Alpine MRV Amplifier