A solo can't do anything with the QC Nav while you're moving. In fact, nothing on the QC will work while in motion.
As for the zip codes, if I didn't have one, or the gps didn't come up with an address or it had multiple streets, I'd google the company name and city. It always comes up. Usually, the street name is misspelled on Workflow when an address isn't found by the gps.
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Now that I have a smart phone, I guess Google is an option - before, I'd have to unpack the laptop & crank it up, and there's seldom time for that before takeoff.
I still think the zip code should be included - it's not a complete address without it anymore.
It's ok if the nav system doesn't work for me, my Garmin does fine. Well, mostly. It sometimes says 'off road' when I'm not, [on Inkster?!] or thinks I've wandered off the route [but the signs say otherwise], but I can work with that.