Accurate crane and trolley positioning is essential for safe, productive construction machinery. On tower cranes, gantry cranes and material hoists, the trolley must stop at the correct radius while the hook stays stable. Poor positioning causes load sway, collision risk, extra wear and slow cycles. Modern systems combine absolute encoders, laser rangefinders, GNSS, inclinometers and limit switches to measure trolley travel and crane rotation. A PLC or industrial controller compares real-time feedback with the target position and adjusts the variable-frequency drive smoothly. Anti-sway control further improves accuracy by predicting load swing and applying controlled acceleration and braking. For operators, a clear HMI shows trolley position, working radius, wind speed, load weight and alarms. Wireless and wired data links send diagnostics to the site office, so faults are found before they stop work. Regular calibration, robust cable routing and dust protection keep sensors reliable on site. When integrated with zoning, collision avoidance and automated lifting sequences, crane and trolley positioning supports faster lifts, lower maintenance and safer construction operations. Commissioning should verify repeatability at multiple radii and test emergency stop behavior. Training helps crews use positioning data correctly and avoid override errors. Durable components reduce downtime in dusty, windy and high-cycle jobs. The result is precise, repeatable motion for demanding lifts.