Originally posted by Vormaerin
As for the blockading questions: a blockade reduces the tax income of each blockaded province by 50%. Also, when blockading you get an additional -3 to your attrition score over and above the coastal modifier. So even if you are not blockading in national waters, you can still stay 'on station' several months longer than otherwise.
Are you sure it is not +3 attrition when blockading
I am at work so I cannot check.