Excellent video. I have a few questions: Was the intent of that to perform a check on the gyro reference? Or to provided real time direction as they bore? If it is just a check, how often do you perform those? Were all of your set ups force centred? Or are you leaving evidence, either on the bottom, or top of the pipe, so that you could occupy those points again? (I was thinking a Leica SNLL321 would be handy for setting/checking nadir points.)
