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The What Three Words system divides the world into 3-metre squares and gives each square a three-word code. For example "pretty.needed.chill" represents a point by the river Cherwell near Oxford in the UK.
The 3-meter resolution matches that of a typical unassisted GNSS receiver.This is a very convenient way to record positions - the Surrey Portable Antiquities Scheme recommends its use for reporting finds.
Recording a position at that accuracy is better than nothing, but bear in mind that the real position is somewhere within three metres in all directions, so within a six-metre wide circle. If an archaeologist wants to come back and search that area later, they may have to dig a very big hole to find the right spot.
Archaeologists have to dig holes to find things but they are painfully aware that by doing so they are destroying other archaeology that could be found in the future using techniques not yet invented, so they want the hole to be as small as possible. Now that they can afford more accurate equipment, they are starting to use it.
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