All strategic aspects are like the Napoleonic Games. Actually, more to the point, at the current time, while the system is exactly the same, only FIW has campaigns that are constructed in the same way as the ones in Eckmuhl or Waterloo.
For example, the main campaign in 1776 bounces you from Bunker Hill to either Germantown or Brandywine as your second battle, with no strategic development between them. (Though, I will say the northern campaign in the expansion set is quite good and more along the line of what would develop later).
All strategic movement is abstracted, and the only naval aspects are the presence of some naval units, which essentially serve as floating gun batteries, and no more.