Basically, if you know any 2 of the values on the nomograph you can determine the third by drawing a line thru the two known values. For example, if you need to know how long it will take for a vessel to travel x distance at y speed, just draw a line from y thru x unitll you get to the time line and you will have the time you needed. For very large values the normal laws of math apply. I.E. if the distance is off the scale (or will result in a line that goes off of the scale of the variable you are trying to determine) you can divide the distance by whatever number is necessary to get back on scale and then multiply the result by the same amount.
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