I dont think these systems would be any use for ultimate trough to peak measurements though. They cant measure froth/ whitewater accurately, just solid water, if they could measure within a few feet though it would be better than nowt,less room for macho arguments. you could plant one at the point at Nazare.
It doesnt sound like Garrett et al are interested in numbers though.
I reckon the MSW coverage is spot on. nice one