From: Tucson, AZ
hmmm, this function seems to have its limits. I was messing around to see if I could create torpedo boats which could move in deep, shallow, and river waters, so I create a "PT Boat" unit with both the light naval and riverine icons, with the hope that it would result in a unit that could move in all of these types of water, like the combination of the light naval and riverine units. Didn't work...
So there is no naval unit which can move in both shallow and deep water? I know this isn't a naval simulator, but seems odd...
Have you tried to give a riverine unit a secondary icon of naval unit?
if the human race ever does get to be space fairing and be able to visit other worlds, let's just make patterns in their crops and leave.