Drag or use the arrow keys to pan the map and the plus and minus keys to zoom. Grid squares are drawn for the visible area, with finer precision as you zoom in. Use the Grid and Call fields in the toolbar to jump to a location, and the path calculator for distance, bearing and terrain line-of-sight between two grid squares.
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The map needs JavaScript. The toolbar above still reports your current grid square and the path calculator works without the map view.
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