Everytime I traverse when I check into my backsight I'm vertically off anywhere from 0.02' to 0.16' off usually low. I can run a whole loop and close horizontally fine but vertically never. Even if I run a level loop and put good elevations on my control points if I shoot a traverse point off the control whether its a hundred feet to a thousand feet if I check back into my backsight I'm off. The further the distance the worse it gets usually but not always. I use a Topcon GPT-3003W with a Carlson data collector and software if that helps.
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