I'm looking at buying a new car and I wanted a built in Navigation, but I keep seeing "DVD Based Navigation" on certain models. Is this different than GPS?|||"DVD based Navigation" is a type of GPS device. It refers to the storage system used for the maps and the operating system.
Some older vehicle mounted systems used CD-ROM. You could keep a series of map packs on CD and swap them out if you entered another region. The DVD based ones allow for greater detail and larger map areas.
The portable units typically use flash memory. You could download map packs off the internet and install them as updates. Some devices have enough storage for additional map packs or have a memory slot for a flash card.
Some factory GPS units use a hard disk drive (HDD) to store the map and OS data. While I'm not aware of any portable devices that do, I suppose it's possible, as there are some pretty tiny hard drives out there, and you don't need huge amounts of storage space to store the map data for the entire planet.
The major drawback to optical disc based storage though, is that you'd have to swap out the disc to get updates, since they're not designed to allow changes in the data. That's not really convenient if you like to keep your maps to be up to date as it means having to get a new map disc.
The flash and HDD types allow for easier updates to the data and might be slightly more responsive on bootup and when searching for map locations. However, for most people, map updates still mean going to the dealer, as I've yet to see a built-in GPS device with something like a USB port to allow the user to update it at home.|||there are two kinds of gps. one is gps, simple fuinctions. another one is dvd gps based navigation. this has many other functions, such as dvd player, bluetooth, ipod function, e-book. you could see this on this website http://www.autodvdgps.com
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