[RightWhale]

what direction the waves are coming from?

If they can detect gravity waves at several separated sites around earth, and if gravity waves propagate at a finite speed, they should be able to see where the gravity wave came from in a general sense. If they detect the gravity wave at 4 sites not coplanar they should be able to narrow down the direction in spherical space. I don't know what angular resolution they expect.

[Jake0001]

I'm not sure how useful it would be.

In all likelyhood the events would be hundreds of lightyears away making the propagation sphere a planer phenomena when it strikes Earth assuming the "wave" has any discernable energy to be measured.

At near-lightspeed velocities and a relatively small window to observe the arc, the "difference" would be measurable in nanoseconds or less - under the assumption that Earth and/or its magnetic field doesn't distort the wave.

Probably just a scientist trying to drum up funding for his research. Not that I disagree with it, it could prove very useful someday.