How to Find Corner Pins

• Coordinates trump vector measurements [1]
• Use a metal detector [2]
• Metal detector, GPS, compass [3]. But - they may be removed in which a surveyor will likely need to mark it.
• Why does a survey cost so much? [4]
• Resolution of satellites is 28 cm in the USA. Google maps resolution appears to be higher because it is aerial photos. [5]. Google Earth is 15m to 15 cm resolution [6]
• GPS is 6 foot accuracy [7]