Has anyone taken the time to contact their hardware creator about this? Just wondering what their explanation would be. We can sit here and assume a lot of things but at the end of the day we're asking them to slew to a location and they're not moving. Seems like there is some bad behavior there.
This would be like if I had a gps that was always 2 blocks off. Sure it's precise but not accurate. And having one of those is not very useful and doesn't get me where I want to be. I guess I should just remember that I need to always walk 2 blocks east and blame the car for not getting me to the right place even after I tell the gps precisely where I am 
Jared