Look at north atlantic map. You'll see that there are three gaps where you can sail from north to south: Scotland - Faroe-island -gap, Faroe-island - Iceland -gap, Iceland-Greenland -gap. Now, your enemy is going to go thru one of these three and you have four fast capital ships to block these gaps. Which way you spread your forces or do you spread them at all? Remember, you dont know which gap enemy is going to use...
Unless, of course, your enemy is kind enough to inform you in advance in order to save you a lot of needless trouble. :lol:
But that wouldn't happen unless they were incredibly stupid and ate with their feet. Which no army has done just yet.