Prosečne GPS koordinate za poštanski broj 405-821: 37.392, 126.687
Spisak gradova:
>> Gojan-dong/고잔동 405-821, Incheon/인천, Namdong-gu/남동구, 702-722/702-722, GPS koordinate: 37.39151,126.68692
Spisak gradova:
>> Gojan-dong/고잔동 405-821, Incheon/인천, Namdong-gu/남동구, 702-722/702-722, GPS koordinate: 37.39151,126.68692