📍 Important Points When Setting Base on a Benchmark (BM) | Surveying Guide Setting your instrument on a Benchmark (BM) is one of the most important steps in achieving accurate leveling and precise site measurements. A small mistake here can create major errors across the entire project. Here are the key points every surveyor must follow: ✅ Confirm the BM Elevation & Coordinates Always double-check the BM values from project drawings or the control point list. ✅ Ensure BM Is Stable & Undisturbed

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