These are not directly comparable measures. An upward projecting fin on the dorsal side of many cetacean species. Dorsal fin shape and trailing edge notch patterns may be used for identification of individual animals. The use of biosonar for the purpose of determining distance and relative direction of objects in the environment. Just as pulsed vocalization does not necessarily mean that biosonar is being used, so the use of biosonar does not necessarily mean that echolocation is being done.
Echolocation is a description of the function of particular biosonar use.
Very little work has even approached documenting echolocation being done by wild dolphins. There has been a great deal more speculation than data collection in this regard. The broad, flat, horizontal structures at the posterior end of cetaceans. These are cartilaginous, not bony. The flukes are moved up and down to produce forward motion.