Using Gravitational Waves as Navigational Tools

With the recent and exciting detection of gravitational waves it seems a whole new era of cosmological observation could be upon us. However, using some forward thinking, what other ways could gravitational waves, and technology based on them, be harnessed?
I had difficulty in finding links to this but I remember years ago reading about how Polynesian's could use differences in ocean waves to determine directions to land and navigate in the open ocean. Imagine then at some future point we could use gravitational wave detectors aboard spacecraft as something akin to a deep space gas (a deep space positioning system or dsps)? Using signals generated by large astronomical bodies one could use their relative strength and direction to determine where in space they were. Going one step further if predictive computer models are used to determine movements of these bodies and changes to them through time, one could also potentially not just pinpoint where in the universe they were, but when! As to practical applicability I can't comment as I don't know how small such devices could be made and still retain the necessary sensitivity. A fun thought experiment nonetheless though!