Gjennomsnittlig GPS-koordinater for postnummer 3640-180: 40.933, -7.55

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Notering byer:
>> Bem Haja 3640-180, Viseu, Sernancelhe, Grijó, GPS-koordinater: 40.9333,-7.55
>> Sarzeda 3640-180, Viseu, Sernancelhe, Grijó, GPS-koordinater: 40.9333,-7.55
>> Seixo 3640-180, Viseu, Sernancelhe, Grijó, GPS-koordinater: 40.9333,-7.55