Latitudes and Longitudes
| Seaport Name | Seaport Code | Country | Latitude | Longitude |
|---|---|---|---|---|
| Dagenham | GBDAG | United Kingdom | 51°27'N | 0°22'W |
| Portland (Uke) | GBPTL | United Kingdom | 50°34'N | 2°26'W |
| Great Yarmouth | GBGTY | United Kingdom | 50°40'N | 1°30'E |
| Methil | GBMTH | United Kingdom | 56°11'N | 3°01'W |
| Bishop Rock | GBBPR | United Kingdom | 49°53'N | 6°27'W |
| Coryton | GBCOY | United Kingdom | 51°31'N | 0°31'E |
| Portishead | GBPTH | United Kingdom | 51°29'N | 2°46'W |
| Gravesend | GBGVS | United Kingdom | 51°25'N | 0°24'E |
| Lyness | GBLYS | United Kingdom | 58°50'N | 3°11'W |
| Londonderry | GBLDY | United Kingdom | 54°59'N | 7°19'W |
| Chatham (Uke) | GBCTM | United Kingdom | 51°20'N | 0°33'E |
| Port Sunlight | GBPSU | United Kingdom | 53°21'N | 2°59'W |
| Gosport | GBGOS | United Kingdom | 50°48'N | 1°07'W |
| Loch Striven | GBLHS | United Kingdom | 55°57'N | 5°05'W |
| Larne | GBLAR | United Kingdom | 54°51'N | 5°47'W |
| Carrington | GBCRN | United Kingdom | 53°28'N | 2°21'W |
| Port Slade | GBPTS | United Kingdom | 50°50'N | 0°15'W |
| Garston | GBGTN | United Kingdom | 53°21'N | 2°54'W |
| Loch Ewe | GBLHE | United Kingdom | 57°50'N | 5°36'W |
| Dundrum Bay | GBDUB | United Kingdom | 54°16'N | 5°51'W |