As of 2015, updates for a Magellan GPS can be downloaded via the Content Manager software from the Magellan website. To determine the latest version of maps installed, click on Menu, then tap on Settings and finally Product Information. The information is located on the Detailed Map NavStreet Version line.
Connect the GPS to the computer using the USB cable. Open Content Manager on the computer, and click Check for Updates. This may require logging into the owner's account. If updates are available, choose the ones that are desired, and click Update. Follow the on screen instructions to download the content.