I think Magellan GPS units needs the least updating
To find instructions on updating maps on a Garmin Nuvi GPS, first navigate to the Garmin homepage. Next, go to the site's support page where you will see a link for "FAQs". On the FAQ page, type "updating maps on a Nuvi" in the text field and click "search".
Car GPS systems are highly accurate providing there is no road construction or detours since you last updated/Synced the device to the servers. Most GPS have automatic updating or even streaming updating which makes arriving at the wrong destination unlikely.
The directions of the GPS should be followed all the time when driving, however new directions can be downloaded all the time from updating your GPS on your computer.
No service required, you simply use gps. Updating the maps can be quite expensive, checkout the best value formney upgrade before purchasing the GPS unit.
To update your GPS maps, you can typically do so by connecting your device to a computer and visiting the manufacturer's website to download the latest updates. Follow the instructions provided on the website to install the updates onto your GPS device. Some GPS devices also offer the option to update maps directly through a Wi-Fi connection.
You can do this through a number of ways. You can choose to go and ask the store where you bought your GPS system if they provide the installing CD, look for it in the internet, or call the company of your GPS system.
Navigation was a factory option.
If you mean updating the software, the reason for this is because things change. Landmarks change and roads. Updating gets all the new info in so your GPS can work properly! This also helps you access any new cool features.
Mine came with a CD
The Mercedes GPS navigation does require an installation cd. From what I read its a waste of money because they usually don't work. It looks like its cheaper to buy your own GPS.
there is a CD cartridge in the boot the of the car this is just for the gps