I see this thread is old (2/27/2006) so I want to revive it.
I'm currently studying for the PADI DM course. When I complete this course and I'm not currently teaching under an instructor as a DM, must I still have insurance? I don't understand why I would if I'm not actively teaching for a shop or otherwise. I would like to have this information clarified soon. My trip is booked and there is no turning back now as I have all the materials for it but this added cost is not something I was anticipating unless I was to teach.
You only need insurance if you are actively teaching. If you are just diving - no worries. The coverage typically covers you from students suing you or the shop with whom you are affiliated. Once you start working professionally, you must have insurance.