The correct answer is B) the same as that used for the charts of the locality. The datum from which the predicted heights of tides are reckoned in the tide tables is the same as the datum used for the nautical charts of the locality. This is because the tide tables and nautical charts need to use the same reference point to ensure consistency and accuracy in navigational information. The other options are incorrect because: A) mean low water is not necessarily the same as the datum used for the charts, C) table three does not specify the datum, and D) the highest possible level is not a standard datum used for tide predictions.