Key points in surveying history (1950 onwards)
- 1950-60's
- Free gyro
- 1960-70's
- Positive Displacement Motor and Bent Sub
- 1970-80's
- Wireline Steering Tool
- MWD
- 1980-90's
- North Seeking Gyro
- Steerable Motor
- 1990-00's
- Rotary Steerable Systems
- Gyro Steering
- 2000-...
- GWD
Prof. Angus Jamieson: Surveying History
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