It was decided to remove the Sonar class, as there does not appear to be a valid class association and PHRF-LO has not had a valid certificate since 2017.
Also, a letter has been sent out to all the other classes on the list (except new classes: J 80 & Sharks) to confirm that they are in fact still active and require this designation with PHRF-LO.
If you have any information that could be helpful, please contact the PHRF-LO office.