Gjennomsnittlig GPS-koordinater for postnummer 21143: 2.986, 99.084
Notering byer:
>> Martoba 21143, North Sumatra, Pematang Siantar, GPS-koordinater: 2.98603,99.08423
Notering byer:
>> Martoba 21143, North Sumatra, Pematang Siantar, GPS-koordinater: 2.98603,99.08423