After running into some surprises making amphibious landings and dealing with supply, I started checking forum posts for advice. Reading the posts, I've discovered that many of the players posting on this board are more aggressive, especially as the South, than I.
As the North, I tend to use my ocean going navy to blockade the South, both brown and blue water, and supply amphibious landings with an eye for taking major southern ports. As the south, my only use for my ocean going navy is to blockade run (I substitute this for industrial investment) and occassionally attack Northern brown water blockading. I also usually try to develop an ironclad fleet to contest the James and a much smaller one to protect the mouth of the Missippi but my investments are generally modest.
I'm curious how everyone else uses their navy as the South and the North. Especially in PBEM games. What goals do you have for your naval forces and how much do you invest in the Navy. I've always had some difficulting getting decisive results out of my navy and I suspect I'm doing something wrong.