Antarctic Digital Database
The Antarctic Digital Database (ADD) is the premier source of vector topographic data for Antarctica.Users must register to use the data
OPEN
China Historical GIS
The China Historical Geographic Information System (CHGIS) project was launched on January 8th 2001, with funding from the Luce Foundation.
Navigational Charts - Electronic
Lake Ontario is on charts 14800 and 14802
Lake Erie is chart 14820
Lake Superior is on charts 14961, 14964, 14966 and 14967
Lake Huron is chart 14860
Lake Michigan is on several charts