I was on one of the last MOTU courses finishing in Dec 1969, and the course was configured primarily for people new to Coastal/18 Gp operations, with a limited refresher side. Of note for the front end that was over 180 hrs flying. The MOCU (IIRC) started about the same time to convert current Shack crews to the Nimrod, whilst the OCU replaced MOTU for the full maritime conversion.