Oh nice, had I studied #17 first. I'd have been the better for it. It covers station point perfectly. As do the following posts. It's nice that your choosing the right stuff to share. Also, to think I was doing anything related to "trigonometric" is laughable. If so, no doubt without knowing it(on accident). I found a Youtube video that seemed to explain it to me. Mainly by measure of units, that if the horizon was the eye line, at 5 feet tall, then using 5 inches for example would represent the horizon to ground line, then the multiplying came in. Clearly I'm new to this, right? haha.