12" parallel ruler with beveled edges& protractor scale

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12" parallel ruler with beveled edges& protractor scale These 12 inch length, 0.22 inch thickness, with brass arms and handles are especially suited for smaller wheelhouses with limited chart table space,. A top quality hand crafted product you can pass on to your children, and they can pass on to their children.Free delivery by 1st. class Intl.air mail postal service worldwide . Wt. 5.5 oz.Instructions:Parallel rulers are used to plot direction on your nautical chart. They are, essentially, two straight-edges hinged so that they maintain the same angle. By alternating the moving edge, and securely holding down the non-moving edge, you can move the rulers about the chart while still maintaining the same angle. To determine the direction between two positions or points on a chart, line up the rulers with the two points and then step the rulers to the nearest compass rose.Once you have the edge of the ruler in the center of the compass rose, you can read the direction. Make sure you read the direction on the side of the compass rose in your intended direction of travel. In this case, to travel from the southern-most buoy to the northern-most buoy, set your course to 045° True. However, to travel from the northern-most buoy to the southern buoy, you would set your course to 225° True.Conversely, to plot a course line from your present read more

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