Depends what you call offshore. For me I usually think of past 20 miles or so. We have lots of good fishing grounds within 50 miles from Barnegat Inlet where I go out. Many good inshore spots as well. Inshore tuna & shark within 25-30 miles too. Sea conditions can be pretty unpredictable so you have to use your own knowledge as your guide. It can be 6-8' inshore and as soon as you hit about 20 out it's flat as a pancake (sometimes not) Just like anywhere else I would think. I'm running a 28' Winner flybridge. 4' draft, real heavy solid glass with a keel so I do pretty well in the rough stuff. Where do you do your boating and what kind of boat are you running?