ISARRA are the main international conference organisation.
The people researching in this area in the UK that I know of are the Met Office (mainly the research station at Cardington), Dr Phil Anderson's group at the Scottish Association for Marine Science, and Prof Rob Mackenzie's group at the University of Birmingham.
None of them, clearly are going to sell you an off-the-shelf product, but they are all experts in the space using locally developed drones for work of this nature.
G