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GPS rover drift caught a 40-foot wall 2 inches off, caught it 3 weeks late

Last month in Denver, the local base station had a firmware update that silently skewed our rover readings, and we didn't catch it until the steel erector flagged the misalignment, so has anyone else dealt with baseless fixes throwing off their control points?
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emery_flores
Had a similar hit last spring, took us a month to figure out the base station patch shifted everything 3 inches.
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