When a speeding boat passes the bottlenose dolphin, it will start to race out in front . They will take off hitting the water and keep going. Dolphins navigate by following the hills and mountains of the ocean floor, by tracking the sun, by sensing currents, and by tasting the water along the journey. A dolphin's sound probably originated in its nasal passages. These nasal passages are located on the top of the head.
Dolphins can make sounds to see what lies ahead.
This sense is called echolocations. The dolphins' sound waves hit an object and the echo bounces back. Echolocation sounds are called sprays. Sprays are so strong they can stun another whale. The Sea World Home Page.