Very handy for sharing exact locations
This is great for when you need to give people a point on the map that doesnt correspond well to an address. For example, when meeting people in a large park you could say "meet me at pickle.stone.insect" rather than "walk downhill from the parking lot, turn left, go about 250 feet, go right at the fork," etc. Or if the entrance to your business is on the side of your building, you can give the 3 words for it rather than have confused customers wandering around trying to find you.
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what3words: Navigation & Maps