Tide heights and definitions - an explanation.
As the tide comes in and out it reaches different levels. This is largely to do with astronomy.
Each level has a name and a meaning behind it. We need to understand each tide level so that we know what reference points we are using. This will stop us running aground and keep us safe.
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Chart datum, height of tide, depth of water, neap range, spring range, MHWN, MLWN, MHWS, MLWS, height of lights, HAT, height of bridges.