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Establishing the height of tide to find the depth of water tells us if we could pass safely over drying heights, how much water we need to anchor to be a ble to float at low water etc. Knowing the tidal height at any given time is very important. And, of course, we add the tidal height onto our chart datum depth to give us the total depth of water. If we have a height of tide of 2 meters, and a chart datum depth is 3 meters, we know the depth of water will be 5 meters...