Latitudes and Longitudes
| Seaport Name | Seaport Code | Country | Latitude | Longitude |
|---|---|---|---|---|
| Kozaki | JPTRG | Japan | 35°40'N | 136°03'E |
| Chiba | JPANE | Japan | 35°36'N | 140°06'E |
| Yokosuka | JPYOS | Japan | 35°17'N | 139°39'E |
| Kobe | JPUKB | Japan | 34°40'N | 135°11'E |
| Aomori | JPAOJ | Japan | 40°49'N | 140°45'E |
| Yokoshima | JPYKS | Japan | 35°40'N | 139°18'E |
| Kawasaki | JPKWS | Japan | 35°32'N | 139°45'E |
| Amagr | JPKSM | Japan | 35°54'N | 140°01'E |
| Yokohama | JPYOK | Japan | 35°27'N | 139°37'E |
| Akitsu | JPAKT | Japan | 34°20'N | 132°24'E |
| Yokkaichi | JPYKK | Japan | 34°57'N | 136°37'E |
| Aioi | JPAIO | Japan | 34°46'N | 134°26'E |
| Yamada | JPYAD | Japan | 33°16'N | 133°40'E |
| Suzaki | JPSUZ | Japan | 33°23'N | 133°17'E |
| Wakayama | JPHIK | Japan | 34°13'N | 135°07'E |
| Muroran | JPMUR | Japan | 42°20'N | 140°57'E |
| Sakaide | JPSKD | Japan | 34°19'N | 133°50'E |
| Uraga | JPKRH | Japan | 35°13'N | 139°42'E |
| Kushiro | JPKUH | Japan | 42°58'N | 144°20'E |
| Matsuyama | JPMYJ | Japan | 33°52'N | 132°41'E |