Basic rules

Every 3-4 breaths, do a frontal breathing. It will let you orientate and avoid deviations.

Use buoys as references in your route. You can also use it to train by intervals.

Train with assiduity in pool and try to improve your bilateral breathing (both sides breathing). It will let you breath in the best side that sea offers to you.

Sea conditions are never the same. Take your time and study water movements, waves and most dangerous areas before enter.

In the sea, your buoyancy is higher than in the pool. Train your strokes and your feet efficiency to fatigue less.