* Day_lrg.jpg: a color planisphere
* utmworld_ced.png: countries outlines

Those are resized at runtime to fit a fixed box.

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* Day_lrg_small.jpg
* utmworld_ced_small.png

Those are already resized and can be used in a lighter version of the
application. However, zooming is not as good as with the above.

utmworld_ced does not really matches with Day_lrg anyway - there's
about no way to have the outline perfectly fit the map from America to
Australia, due to some distorsion and rotation difference.