More than a year ago, we tagged our cattle with solar powered gps ear tags to help us determine where on our 700+ acre farm they were. The tags also send information back on temperature and individual animal movements, and alerts us if the tag has moved outside our designated pastures or if the in fact, stop moving (dead, down or stuck).
The system, by 701x, has worked well for us, and enables us to keep track of our herd, even if not on the farm due to other business travel. Due to some connection inconsistencies, 701x has replaced all of our tags, so the retagging project has begun!