We (saza36) do own a chirp cache but the chirp only gives the final location of GZ. As stated, chirp needs to be enabled and the firmware in the garmin device must be recent enough to support chirp devices - the early Oregons original firmware did not. We have never had problems reported and if can be accessed a good 30 feet away. We put full details on the cache page and invited those without chirp enabled devices to email us for the final location instead. This was in that sense more a chance for people to test their gps devices. See GC2KMRM
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