Creating a grid in mapinfo

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i Need help in mapinfo. We are doing Raster based GIS and cartographic modelling. I need to create a 100mX100m grid in mapinfo, but i'm not sure what extents i have to set for going further. Object type: Closed Regions Smoothness: 0 Spacing Between lines is 100 meters, and projection set to British coordiante system.. please help me to make the grid.

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It looks like you are using the 'Grid Maker' tool supplied with MapInfo based on the parameters you specified in your question. The extents are simply the minimum and maximum coordinates of the area you want covered by the grid. When you draw the rectangular area for your grid, these values are auto populated based on the rectangle you have drawn. If you want to manually adjust or change that area then you can do so by changing those values. So, let's say you want a grid which covers the area between 0,0 and 10,10 you would set your extents as:

North: 10 South: 0 East: 10 West: 0