-Point the camera explores the BM (Bench mark) to link the land rings, pins, pins, the PIN must be set in the triangle area, it's probably healthy. Use it as a reference point, and easy to find out the pins in the future. In the survey, this time using a pin-point drop pins, steel nail head BM. in the case of a survey in the area of camera output pins. In the case of a piece of land surveying coordinates out pins next time.
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