Oh the old man does all of the computations and his son measures and marks. The old man is in the hospital , but he has his computer and phone so the son is coming up Maybe Monday and will send his readings to the father in the hospital. Or something like that. Kind of sketchy , not sure I can trust the survey to be accurate . The old man has a Masters in Engineering , licensed in several states. Seems to know what he`s talking about. The son however seems to be the week link. I think he`s been trained by the father and has limited abilities and some disabilities. I really can`t see why the job is taking over 4 months. they are working off of two corner markers I showed them of a nearby surveyed property.