Is there a GPS unit that you can add missing streets?

I'm researching GPS units to go into emergency vehicles that serve very rural areas. Experience with other units, they always seem to be missing some of the small "back roads". Is there a unit out there that you can add these missing roads in own your own?|||Not that I know of, but if you're doing this professionally I'd contact a salesman at Garmin, TomTom, Magellen, etc. They will know if there are "professional" models that do more than consumer models. Contact info should be on their websites.





You can (or should be able to) update the databases on your GPS on a regular basis along with the firmware though an internet connected computer. Usually though USB.|||I completely understand. Most mapping applications are FAR behind the actual street data. My address has existed for over seven years, but still not on any mapping software. Google maps doesn't show it in map mode, but it is clearly there in satellite mode, and those are old as well.

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|||old 1s usually have missing streets, sorry i dont fully understand the question though