Bt747 allows for configuring MTK/MTK2 based GPS data loggers (GPS trackers) and downloading track data (GPS logs) to your PC. It can convert and export logs to various formats, geo-tag pictures and upload A-GPS data to the GPS device. BT747 is a stable and versatile atlernative to the vendor-specific, often half-baked solutions that come with the GPS devices. A list of supported devices can be found here: http://www.bt747.org/de/compatible_gps . The software is Java-based, a J2ME (mobile) version is available as well.