If you balance it against needing medical attention very quickly it would be a fair trade off of your privacy. I use a chainsaw quite a lot and should I hurt myself I'd be glad of anything that would speed up my rescue.
To be fair it is a pretty handy system for dealing with people who are less than au fait with traditional lat/long coordinates. We were given a heads up about it at a sprayer operator cpd course last year as a way of getting emergency services to your location when off the beaten track and I know field trials guys and archeologists that we currently have working on the farm are using the system.
To me it seems like a gimicky version of gps but if it's easier and works for people that aren't used to grid references then any thing that could potentially help with determining your location has to be a good thing especially in an emergency
I’m a member of an alternative living group on Facebook; partially because I’m interested in some of the technology and partially because I find the arguments about who’s being the most alternative amusing (which I think makes me a borderline troll); some of the members are very concerned with the big brother connotation; without seemingly seeing the irony that they’ve declared their independence from “the man/grid” on Facebook, which is quite firmly owned by the same “man”.