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When we import a grid that is not the native grid of Grid+ into Grid+ (this grid file does not have projection information in the file), for example, RGF grid (*.grd), we need to define projection for it by selecting right-mouse click on the grid layer in the Layer Control and then selecting Properties, the Grid Settings form will pop up. We select Coordinate System tab, click the Define button. Then, we should select the proper spatial reference, either geographic or UTM coordinate system. Then click the OK button to finish the projection defining step. Next, right-mouse click on that grid layer in the Layer Control, then select Zoom to Layer option, the grid will be located in the right place.