The NAVIGON 7200T marketing material says that the NAVIGON 7200T has 2GB internal flash. Now the device comes with a Micro SD Card, why is that?

To ensure on time delivery and a high quality experience for our customers, NAVIGON decided to implement the Micro SD Card approach in bringing the 7200T to market. The Micro SD Card in the NAVIGON 7200T contains everything you need to power your 7200T, including navigation software and pre-loaded maps. Whether your software is loaded on an SD-Card or on internal flash memory, the experience is no different. The Micro SD Card must remain inserted to operate the device. NAVIGON may transition the 7200T and other NAVIGON products to other storage formats in the future.

Most likely the same for many other GPS devices.

http://support.navigonusa.com/support/questions/126/The+NAVIGON+7200T+marketing+material+says+that+the+NAVIGON+7200T+has+2GB+internal+flash.+Now+the+device+comes+with+a+Micro+SD+Card,+why+is+that%3F