The 1925 Meteor Sonar was not invented by a single person. It was a result of collective research and development efforts at the German Naval Observatory in Hamburg.

Here's what we know:

* The "Meteor" research vessel: The sonar was developed for the German research vessel "Meteor," which was involved in extensive oceanographic expeditions during the 1920s.

* Collective Effort: The sonar was developed through a combined effort of scientists and engineers at the German Naval Observatory, including but not limited to:

* Gerhard Schott (leader of the "Meteor" expedition)

* Robert Courant (physicist)

* Hans-Joachim Kühn (engineer)

* Technical Advancements: The 1925 Meteor Sonar represented a significant advancement in underwater acoustics and sonar technology. It used piezoelectric crystals for sound generation and detection, paving the way for future developments in echolocation and sonar systems.

Therefore, it's more accurate to say that the 1925 Meteor Sonar was developed by a team at the German Naval Observatory rather than a single inventor.