GPSs are great new devices that have come to market, and they offer lots of great new features for drivers, which promise to make driving easier and safer. A suction cup mount which attaches a GPS to a windshield is a common accessory which plays a vital part in the functionality of a GPS. Here's a bit about just why these suction cup mounts are so important to the main functionality of GPSs.
Having a portable map that always knows where you are is great, but if that was the only feature which GPSs offered, then you would still need a friend to ride in the passenger seat and navigate. Most GPSs also offer the ability to read directions out loud, and show very simple maps to the driver to aid them in finding turns. However in order to be effective, a GPS must be placed somewhere close enough that the driver can hear it and see the maps without being distracted from the road.
Some cars are beginning to offer built in GPSs and there are some devices which are designed to hold GPSs up on the dashboard where the driver can see it easily. However, the suction cup mount remains by far the most popular way to mount a GPS near a driver. By holding a GPS near the windshield, the driver is not as distracted when they have to look at the map - in fact, it's no more distraction than checking the speedometer. This makes GPSs a lot safer for use while driving.
Some states have made movements to ban having a suction cup mount in your car, because they are worried about distracted driving, or are afraid that the mount gets in the way of the driver trying to look out the windshield. However GPSs are becoming more and more popular, and other than having a built-in GPS, using a suction cup mount remains the best and safest way to use a GPS while driving.
These mounts most often come with GPSs, but if you have a GPS which did not come with a GPS, then you can purchase a mount as an additional accessory. Many manufacturers offer mounts as an accessory or replacement part, but there are also universal mounts available in case one isn't offered that is specifically tailored to your GPS model.