Gjennomsnittlig GPS-koordinater for postnummer 17320: 45.824, -1.071

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Notering byer:
>> Hiers-Brouage 17320, Poitou-Charentes, Charente-Maritime, Arrondissement de Rochefort, GPS-koordinater: 45.8483,-1.0731
>> Marennes 17320, Poitou-Charentes, Charente-Maritime, Arrondissement de Rochefort, GPS-koordinater: 45.8228,-1.1055
>> Saint-Just-Luzac 17320, Poitou-Charentes, Charente-Maritime, Arrondissement de Rochefort, GPS-koordinater: 45.8,-1.0333