This is a really minor issue, but I thought I should mention it.
It looks like the elevation/depth data in Command is relative to sea level. This is not really a problem, seeing that it is a game about naval combat, but it does create a few oddities...
You can only put ships in parts of the Great Lakes. Other parts are "land." In fact, the entirety of the African Great Lakes are land because of their overall elevation. Lake Baikal is mostly "water," though, as is the Salton Sea. And Death Valley.
I'm not sure if there is any way to fix this, or if it even worth the trouble, but it would be nice to have the Great Lakes or the African Great Lakes available as locations for scenarios someday. In the meanwhile, I will content myself with hunting sand pirates in Death Valley.
