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Yea, the coastline paradox. You can make it as long or as short as you like, depending on your purposes.
That said the channel is 350 or so miles long point to point and I would assume four boats would be deployed on patrols at sea were crossings were actually viable.
Not that I think involving the navy will change the situation at all, rather the issue of the length of the coastline at high resolution seemed an odd one to raise. Very few boats currently land before they are intercepted, apparently.
But this is channel ops though?