In both Grew Wolves (GW1.1a) and GWX there are ships in every harbour. If you're looking for capital ships check out this list
Moored capital ships (spoiler)
Below are the dates and locations of moored capital ships, extracted from the game data files and listed in chronological order. Note that the dates only seem approximate.
- 1939/09/15 - 1939/10/10, Auxiliary Cruiser, Scapa Flow
- 1939/10/04 - 1939/10/14, Battleship Revenge, Scapa Flow
- 1939/11/01 - 1940/01/05, Battleship Nelson, Loch Ewe
- 1940/03/01 - 1940/05/01, Auxiliary Cruiser, Scapa Flow
- 1940/03/07 - 1940/04/25, Aircraft Carrier Illustrious, Scapa Flow
- 1940/04/01 - 1940/06/01, Auxiliary Cruiser, Scapa Flow
- 1940/05/17 - End of war, Fiji Light Cruiser, Loch Ewe
- 1940/05/24 - 1940/06/30, Dido Light Cruiser, Scapa Flow
- 1940/12/11 - 1940/12/31, Battleship King George V, Scapa Flow
- 1941/02/01 - 1941/02/17, Auxiliary Cruiser, Scapa Flow
- 1941/02/10 - 1941/03/20, Auxiliary Cruiser, Scapa Flow
- 1942/02/03 - 1942/02/28, Battleship King George V, Scapa Flow
Overlapping dates mean there are 2 ships in the same harbor, ex. Oct. 9 1939 both Revenge and Aux. Cruiser are in Scapa Flow