Moorings Sailing Holidays What Would Be The Best Type Of Keel For Estuary Moorings ?

What would be the best type of keel for estuary moorings ? - moorings sailing holidays

I think to get a job rather small boat up to 20 meters. I intend to keep in estuary waters, which sit the best way to have the keel at low tide in the mud / silt.
I know nothing about sailing, it is a website that basic concepts such conditions and help navigation equipment, etc. Thanks