When many people think of Sealegs amphibious boats, they imagine something like the original 6.1-metre RIB that kicked off the range in the mid-2000s - something smallish to buzz about in then drive back up the beach to the boatshed. But the concept, and the company, has come a long way in the last 20 years, and the latest craft to hit the water sets a new standard in terms of what an amphibious alloy RIB can be.