Multiple full-sea and full-land hexes

[mroyer]

In the map editor, what is the purpose of having multiple sprites for a full-sea and full-land hex. Indeed, if I use a specific sprite index number for a full-sea hex, it is likely it will be automatically changed to another full-sea sprite. This normally isn't noticed, until you try to make different sprites for full-sea, for example.

Thanks in advance for any thoughts on the topic,
-Mark R.