If you were at sea or on a river or dam and got caught in a dense fog, it may be nice if your map showed both the normal high water mark and the normal lower water mark for both dam and river/coastline boat ramps.
Therefore maybe use the node=slipway for both and have a service road in between. For dams, maybe show the 80% full point and the 20% full and for tidal ramps show the high and low astronomical tide points (the HAT and the LAT)
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