Question 1958Navigation General

The correct answer is D) added to or subtracted from the charted depth. To predict the actual depth of water using the Tide Tables, you need to add or subtract the tide height (the number obtained from the Tide Tables) to or from the charted depth shown on the nautical chart. This is because the tide height represents the variation in water level from the charted depth, so you need to adjust the charted depth accordingly to get the actual depth at a given time. The other options are incorrect because: A) dividing by the charted depth would not provide the actual depth, B) the number from the Tide Tables is not the actual depth itself, and C) multiplying by the charted depth would not give the correct adjustment to the water level.