24/09/2026
Levelling Basics for Beginners
How to find Height of Instrument (HI)?
Formula: BM + BS = HI
Where,
BM = Bench Mark (Known Height)
BS = Back Sight Reading
HI = Height of Instrument
In this reel, BM = 102.000m. So HI = 102.000 + Staff Reading.
Levelling Settings Benchmark