Latitudes and Longitudes
| Seaport Name | Seaport Code | Country | Latitude | Longitude |
|---|---|---|---|---|
| St. Helier | GBSTH | United Kingdom | 49°11'N | 2°06'W |
| Runcorn | GBRUN | United Kingdom | 53°21'N | 2°44'W |
| Heysham | GBHYM | United Kingdom | 54°02'N | 2°55'W |
| Rosyth | GBROY | United Kingdom | 56°01'N | 3°26'W |
| Bowling | GBBOW | United Kingdom | 55°56'N | 4°29'W |
| River Blackwater | GBRBL | United Kingdom | 51°45'N | 0°51'E |
| Harwich | GBHRW | United Kingdom | 51°56'N | 1°14'E |
| Portree | GBPRT | United Kingdom | 57°24'N | 6°11'W |
| Bo`Ness | GBBON | United Kingdom | 56°01'N | 3°37'W |
| Redcliffe Bay | GBREB | United Kingdom | 51°29'N | 2°47'W |
| Hartlepool | GBHTP | United Kingdom | 54°42'N | 1°12'W |
| Peterhead | GBPHD | United Kingdom | 57°30'N | 1°50'W |
| Aultbea | GBLHE | United Kingdom | 57°50'N | 5°36'W |
| Purfleet | GBPUR | United Kingdom | 51°30'N | 0°15'E |
| Hamble | GBHAM | United Kingdom | 50°50'N | 1°19'W |
| Old Kilpatrick | GBOKK | United Kingdom | 55°55'N | 4°27'W |
| Ardrossan | GBARD | United Kingdom | 55°38'N | 4°49'W |
| Preston | GBPRE | United Kingdom | 53°45'N | 2°40'W |
| Grimsby | GBGBY | United Kingdom | 53°34'N | 4°00'W |
| Oban | GBOBA | United Kingdom | 56°25'N | 5°28'W |