Average GPS coordinates for postcode sg6: 51.987, -0.218

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Listing cities:
>> Norton SG6, Hertfordshire, England, GPS coordinates: 51.9944,-0.2084
>> Willian SG6, Hertfordshire, England, GPS coordinates: 51.9869,-0.2175
>> Letchworth SG6, Hertfordshire, England, GPS coordinates: 51.9794,-0.2266