When surveying a cave, we try to get the best accuracy that is easily obtainable. But, what is obtainable, and at what cost of time or money? How good can you get?
It has been stated that for azimuths, front sight - back sights should agree to 2 degrees or better. I don't know the standard for tilt or slope distance. Of the three dimensions (distance, tilt, azimuth) which one has the most need for accuracy? I would think that distance is, at least in a horizontal cave. It seems as though the vertical caves that I've been in aren't vertical enough. I would think that tilt angle needs the least accuracy. I mean, if a passageway tilts by 20 degrees and then changes to 35 degrees, that means something. But if a passageway tilts by 20 degrees and then changes by 2%, that means almost nothing. I'm just thinking ahead toward loop closure.