As mentioned in the previous FAQ, only the area maps within the Mapsource software can be transferred to the data card via the USB programmer. These area maps contain a large quantity of information and are usually 6-8 megabytes each in size. You may either transfer the basemap to the data card through the USB programmer or direct PC to GPS connection through the PC cable that is supplied with the GPS. Transferring one area map to the data card via the USB programmer takes approximately 20-30 seconds. Transferring one area map to the data card via the PC connection as mentioned above can take as long as 20-40 minutes. Therefore, the USB data programmer saves a significant amount of time when transferring the area maps to the data card.