beach. Further offshore the Earth's magnetic field is used to maintain an offshore direction and therefore head towards the open sea.

The ability to head in a given direction without reference to landmarks, is called a compass mechanism and where magnetic cues are used to achieve this it is called a 'magnetic compass'. Hatchling loggerheads mature within the North Atlantic Gyre and it is important that they stay within this current system since here water temperatures are benign. It has been