i dont think so garmins gps is not set up to share its gps data over usb or bluetooth. you best bet is to get a bluetooth gps unit and use bluegps on the gtab to get navigation they modules run about 20-60 dollers for most and work just great.
Actually Garmin gpsr's do share their signal via usb. I have used my gpsmap 60csx with my wndows laptops using garmin software Nroute and their mapping software. I am still looking for a method to use it with android.