Then combine this with depth perception and it is just about as good as a second set of eyes. Imagine walking around in utter darkness, or perhaps to be blind. Having the blessing of sight removed from your character, echolocation would be a good thing to have. In some respects the ocean is much like the darkness, where there are times when the water becomes so murky you wold not be able to see 10 feet in front of you. Because of this echolocation feature, it is necessary for them to constantly emit sounds generated from an organ just below their blowhole, which is capable of producing nearly 300 different sounds.
Dolphins are one of the most intelligent mammals.
They have the ability to recognize human words and thus are subject to great training. In fact, specialists have stated that it may be quite possible for a dolphin to learn a true language and to communicate to humans through it.