What is the Flush Deck Correction and what type of vessels does it apply to?

The Flush Deck Correction is a specific adjustment made to the freeboard of vessels, particularly Type B vessels that are up to 100 meters in length. This correction is necessary because Type B vessels often have structural designs that allow for a continuous deck, which can result in different buoyancy and stability characteristics compared to other vessel types.

The correction increases the tabular freeboard for these vessels to account for their unique features, such as a flush deck that may lead to less effective weight distribution and stability when at rest or laden. This adjustment ensures that safety standards are maintained, reflecting the actual conditions the vessel will encounter at sea.

In this context, the other choices do not accurately define the Flush Deck Correction. For instance, an increase in freeboard for vessels over 100 meters does not apply since the correction specifically pertains to vessels of a certain type and length. Additionally, stating it applies to Type A vessels or has no effect on freeboard adjustments does not align with the established definitions and regulations concerning flush deck designs. Therefore, the focus on Type B vessels under these specific conditions makes the choice correct.