Gjennomsnittlig GPS-koordinater for postnummer 78280: 48.773, 2.074
Notering byer:
>> Guyancourt 78280, Île-de-France, Yvelines, Arrondissement de Versailles, GPS-koordinater: 48.7733,2.0739
Notering byer:
>> Guyancourt 78280, Île-de-France, Yvelines, Arrondissement de Versailles, GPS-koordinater: 48.7733,2.0739