It support Bluetooth GNSS(GPS, GLONASS, Galileo, Beidu, QZSS) receiver on Android for OpenStreetMap mappers. Very aggressive fork of bluegps4droid project(git://git.code.sf.net/p/bluegps4droid/git)
Sometime, when you switch back to Bluegnss, the main window shows the button "start" for connecting the bluetooth receiver and logging the nmea, even thought, it is already connected/logging.