Well.... the st johns river officially has NO 93 octane anymore, so weekend trips the boat club is planning involves a little more planning on my part as far as distance and milage goes...

is there any internet site where i can easily figure out navigation miles from point A to point B, etc....

Google Earth and it's free. Go to tools, then ruler and you can run a straight line or a path in miles, natical miles, yards, feet, whatever.