A Mislabelled EPSG Code in a Dropdown Could Place Belgrade in Rajasthan

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A developer discovered a critical coordinate system bug while documenting a mobile mapping ingestion system that processes LiDAR road surveys. The upload form offered two EPSG codes labelled as the same Gauss-Krüger zone 7 projection, but one — EPSG:8686 — was actually Slovenia's national grid, offset by six degrees of longitude. Applying the wrong code to Belgrade coordinates produced a location in Rajasthan, India, roughly 5,400 kilometres off. No survey data had been processed using the erroneous option, so no records were corrupted. The correct modern EPSG code for Gauss-Krüger zone 7 in the Balkans region is 3909, and the error stemmed from a gap in a numeric series that made a nearby, plausible-looking code easy to mistake for the right one.

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