Chart for Calculating Free Surface Effect
To avoid having to make calculations from the
formula given in the previous section, a free surface
effect chart based on this formula is used to find the
reduction in GM that occurs as a result of free surface.
Such a chart is shown in figure 12-30.
To use this chart, draw a straight line from the
appropriate point on the ATHWARTSHIP
DIMENSION scale (A) to the appropriate point on the