Gjennomsnittlig GPS-koordinater for postnummer 21315: 2.965, 99.8
Notering byer:
>> Indra Sakti 21315, North Sumatra, Tanjung Balai, GPS-koordinater: 2.96509,99.8003
Notering byer:
>> Indra Sakti 21315, North Sumatra, Tanjung Balai, GPS-koordinater: 2.96509,99.8003