Average GPS coordinates for St Martin Postcode location: 50.185, -4.868. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). St Martin on map:

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Listing cities & postcodes (2):
>> Cornwall, PL13 St Martin, England, GPS coordinates: 50.3392,-4.5575
>> Cornwall, TR12 St Martin, England, GPS coordinates: 50.0312,-5.1791