I'm not so sure at current, but I had my boat covered through my normal short term risk. (Obviously not on motor failure, mechanics) but on lost/damage and 3dr party. My Interceptor was covered for say R100k for about R89 bucs a month for this. The boat was stripped from all electronics and wiring GPS's, radio and fishing tackle. I was able to replace all of this with the insurance cover.
I'm not allowed to advertise or mention names, so pm me for more info should you require.