Gjennomsnittlig GPS-koordinater for postnummer 21313: 3.041, 99.821
Notering byer:
>> Perwira 21313, North Sumatra, Tanjung Balai, GPS-koordinater: 3.04114,99.82118
Notering byer:
>> Perwira 21313, North Sumatra, Tanjung Balai, GPS-koordinater: 3.04114,99.82118