Many GPS devices have the option to support the use of Secure Digital (SD) cards. SD cards are small removable storage devices that are capable of storing many different types of data. Although GPS devices do have some installed memory, it is usually not enough to store several maps of different locations. Fortunately, it is possible to install new maps on an SD card which can then be inserted into the GPS device and accessed.
Insert the SD card into the SD card slot of your computer. The computer will automatically detect it and open an "AutoRun" pop-up window. Select "View Files and Folders" from the list of options. The SD card window will open.
Go to the website that manufactures your GPS device. Navigate to the "Maps" section, then click "Download Maps" or "Buy Maps" (See Resources). Choose your device from the list of options, then select the map you want to download.
Click the "Proceed to Checkout" or "Buy Now" button, then provide your payment information. Click the "Download button" once your payment information is accepted. Select the computer's desktop as the location to download the map. The map will be downloaded to your desktop.
Click the downloaded map and drag it into the open SD card window. A pop-up window will open displaying the status of the transfer. The window will close once the transfer is complete. The map is now installed on the SD card.
Remove the SD card from the computer and insert it into the GPS device. Navigate to the card using the menu in the GPS device and click the map to open it.