GARMIN BLUECHART AMERICA SINGLE UNLOCK CERTIFICATE - With your purchase of this Garmin map certificate, you can have access to download Bluechart MapSource navigation map detail from one additional area of your choice. Package contains coupon code that is needed for the bluechart download process. MapSource America BlueChart CD is required.

Follow instructions on the Garmin blue chart certificate to unlock one region, then download the map data to a blank data card or compatible Garmin unit. To reprogram a data card, simply download different areas.