I don't think its right to do, whether its legal or not.
As much as I embrace technology, in particular due to safety reasons, I also loathe technology when used in a way to cheapen or make the hunt easier.
IMO, I think many are looking for the shortcut versus putting in the effort, time and commitment. No "one thing" is causing this, its the combination of all of the best technology. Lighter gear, better shooting rifles, better optics, better shooting bows, trail cams, GPS, google earth, mapping technology, information at your fingertips, GF agencies hunt planners, web sites, and on and on and on.
All these things are going to impact us as hunters, and not for the better. Its all going to mean shorter seasons, less tags, and less days in the field. No way around our technology causing steep inclines in success rates and lowering of opportunity. Just the way it has to be.
I view this particular issue of texting waypoints of animals as just another way to make things easier. It seems to me an awful lot hunters these days are wayyyyy more interested in the end result of a dead animal, than they are of all the stuff that gets a hunter to that conclusion. I'm the other way, the means, the how, and the struggle's/challenges is what its about to me. The dead animal at the end of a hunt doesn't change you, its the journey there that does.