To get the crosshairs working properly you need to set the variable bas_60mapsize = 512. That can be done via the init line of the player unit or some other method (as long as it is set when the mission starts).
To actually see the island display, you'd need to make a custom texture of the islands, then use the setobjecttexture method as outlined in the readme. (This texture can go into the mission folder).
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