Join Date: Mar 2007
Location: New England
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Simple Answer...Find Another Spot
Boat draws 1. 8 m (~ 6 ft), chart says 2 m, assuming that is a MLW or MLLW reading, so you have only 0.2 m (8 inches) of water under your keel in ideal conditions. If low tide actually lower (frequently), than you're in the mud/rock or if you have any sizable waves even at normal low tide hieght , keel could be hammered constantly into the sea floor on a frequent basis.
Here in the Massachusetts, US North Shore area, the average tide is 9 ft. But unusually high tide range, it could be almost 13, or +/- 2 feet on each side of the tide. At Mean Low Low Water, chart values, if 8 ft is represented on the chart and is accurate for that area, than during the large tides, the the height in that chart area could be as low as 6 ft.
My boats draws 6 ft. My mooring at MLLW on is about 9 ft. During the Spring and Full tides, the low tide depth at my mooring can be as low as 7 ft. A little dicey for my liking, but the bottom is soft mud, which isn't as bad as rocks.
My recommendation, if you can is to get a mooring spot where the low water height is at least 50% more than your draft. So for your 1.8 m draft, 2.7 m as a recommended minimum, 2.4 m may be OK if in a very calm (area with no waves or strong winds). However, that still may not be enough if your area has a huge tidal height range.
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