the maps better - and more maps
In order to see the maps better you have to download the program DJVU. Start here. It gives you the opportunity to zoom in on details - names of small villages, ships and much more.
You then will get 27 records with pictures of 11 maps.
You then will get 31 records with pictures of 12 maps.
Doubleclick on the small picture you will get the record with all information. Doubleclick again and with DJVU you can see the map with all details.
You can start REX from here