There are a number of technologies that we provide. Radio frequency is the oldest. The first program started in 1987 here in British Columbia, and it's extremely reliable. It is proven technology that has been used for many years on hundreds of thousands, if not millions, of individuals in North America.
GPS, I would say, is very reliable, but it's a much more complex set of technologies that require proper training and understanding and feedback, so the training and specific knowledge of the user become key in that reliability. Someone who doesn't know what they're doing with the technology will not see it as reliable. That same technology, that same box, used by someone with a great deal of knowledge and understanding will be seen as extremely reliable. The human factor becomes very strong when dealing with the technology today. It is complex technology.