So long as you can receive one or other beacon within the passband (and it's CW), a single stick software drift connection is possible. I have some gnuradio code that does just that (although I'm using my Ettus USRPs, but the same code could be used with a dongle
Whether a tablet would appreciate the extra overhead of gnuradio is another matter of course.
For those interested, Basically I take 250k of B/W, Filter and Decimate around the 'beacon', then send to a FFT, measure the 'strongest' bin, calculate what that frequency is, compare against the 'correct' frequency, and send the difference back to the USRP or Frequency Translating FIR Filter (otherwise known as the Virtual Big Tuning Knob!)
In the case of a dongle, it would need to be the FIR Filter, as the drivers in gnuradio don't let you change the frequency of the device once set without stopping and restarting the flowgraph.
Note, my code will go down to 250mHz (Yes, milliHertz). Overkill, yes (although not for some of the experiments I intend to do), but remember that when the beacon is in PSK mode, there will of course be frequency shifts every time the phase changes to deal with. I'm hoping at least one beacon will always be in CW mode