they need to know where the first-aid kit is, how to use it and how to operate an oxygen bottle.
Actually, no recognised Senior First aid course will teach you how to use an oxygen bottle. Nor will they teach you how to use an airline's first-aid kit. Ring up St John's and ask them what is in a Qantas/Jetstar/Rex/Virgin first-aid kit. They will not know.
It is all taught in in-house Emergency Procedures/ Medical training.