In KZN I think you will find most clubs use 29 Mhz, and VHF only when you leave an area controlled by a port captain. So on our stretch of coast it is probably only launching out of Durban harbour that you need VHF. From past experience it seems that they do not use VHF from Richardsbay Skiboat Club and Meerensee, not sure why not because you are in port captain controlled water?
In Mozambique, it seems that everyone uses VHF.