Just to show where I stand, I made a quick ePUB version for the colour maps (so, they don't look good on eink screens). It's 88MB, the b/w version would be almost double size. You (all) can test it and tell me if it's worth to publish this and if the "interface" is usable.
Below each map there are four arrows for displacement, the symbol in the center is for zooming in, the symbol in the top-left is for zooming out.
This is the file:
http://djelibeibi.unex.es/files/World%20Map.epub (88MB)