hlb
RIP
Better than that would be a long stick to prod about with, it would be as well to do this in grid formation, a bit like mine sweeping. Deca navigation was invented in 1945 for the dday landings, the mine sweepers were kept exactly on course by the deca and they traveled a path a bit like a ploughed field across the english channel, proding away for mines on there way. Course in this event it would only be nesesary to prod around the harbour or where ever the grounding was to take place. Core samples could be taken and analised for load bearing qualities. Course this all would all depend on length of stick, water available and computation times for analisis of data recorded. All of course which must be calculated before the tide recedes. There for an exit plan must be developed inorder to escape over any bar or shallows, before one is inextraudenarily trapped. Where upon grounding will take place where ever!