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This Concept Map, created with IHMC CmapTools, has information related to: How to make a middle latitude chart, Construct the grid of the chart in Autocad. Define 1' longitude as a certain amount of mm and then use the factor to get 1' latitude in a certain amount of mm. Fifth step Measure the height and width of your grid and fill them in the Excel sheet (open below), Make one large chart of Terschelling Harbour How? By using this procedure:, Fill in the left corner of the grid in coordinates (Latitude, Longitude). This will be your zero point in the XY coordinate system Seventh step Convert the measured points to an XY coordinate (in mm from the zero point) with the Excel sheet, Making the middle latitude charts How? By using this procedure:, Convert the measured points to an XY coordinate (in mm from the zero point) with the Excel sheet Eighth step Go to your grid in Autocad and put the pointer in the left corner and fill in the coordinates XY of a point in mm and construct the point. Repeat this step with all your points., Define the proportion between 1' in longitude and 1' latitude with the known formula. This will give you a factor. Fourth step Construct the grid of the chart in Autocad. Define 1' longitude as a certain amount of mm and then use the factor to get 1' latitude in a certain amount of mm., Define the corners of the chart Second step Define the middle latitude of the chart, By using this procedure: First step Define the corners of the chart, Measure the height and width of your grid and fill them in the Excel sheet (open below) Sixth step Fill in the left corner of the grid in coordinates (Latitude, Longitude). This will be your zero point in the XY coordinate system, Making the middle latitude charts First step Make one large chart of Terschelling Harbour, Define the middle latitude of the chart Third step Define the proportion between 1' in longitude and 1' latitude with the known formula. This will give you a factor., Make one large chart of Terschelling Harbour second step Devide the large chart into 4 detailed charts, Go to your grid in Autocad and put the pointer in the left corner and fill in the coordinates XY of a point in mm and construct the point. Repeat this step with all your points. Ninth step Link the points and complete the chart