Yet nations like Japan and South Korea have none, despite being among the most dependent on sea trade. Their navies are not bluewater-capable, either out of choice or out of economic and technical necessity.
The Japanese Maritime Self-Defense Force is one of the largest navies in the world, ranking at about even with the Royal Navy. South Korea also has a pretty large blue-water fleet as well. Both, IIRC, have participated in the anti-piracy patrol around East Africa.