Average GPS coordinates for Blackwall Postcode location: 51.51, -0.002. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Blackwall on map:

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Listing cities & postcodes (1):
>> London, E14 Blackwall, England, GPS coordinates: 51.5097,-0.0016