in MD you can hunt from a boat on WMA's (Wildlife Management Areas) aka public hunting areas.
http://www.dnr.state.md.us/wildlife/allwmabyregion.asp
Some WMA's allow you to hunt offshore as much as 300yds.
There are also a bunch of other public areas with limited duck hunting that aren't WMA's. State parks, and state blinds and blind sites...etc.
Otherwise you have to be 800 yds from shore while in the main stem of the Chesapeake and Tidal Potomac. St. Mary's county is being changed to 400 yds now and AA and Harford are 400 yds too, and maybe Baltimore. You can hunt all species in this area if the duck season is open. It is considered the offshore waterfowl zone.
The sea duck zone is similar, but stretches into a few of the rivers and the sea duck season is usually around 107 days.
You can successfully use a sneak box in the open water if it is up to handling what the bay can throw at you. I used my dad's estuary for a few seasons and had more than enough areas to use it.
The blind site system is pretty simple. Land owners have first rights to licensing their shorelines. They can do it for 3 years at a time. Hunters can license a spot on the shoreline for 1 year at a time. In order to hunt the site you must do your due diligence and make sure you are of legal distance to houses, blinds, bridges, causeways....etc.
Queen Anne and Kent Counties do not allow the licensing of shorelines by the public. Owners can still hunt off of their properties.
I believe a blind site cannot be more than 300 yds from shore or more than 1/3 to the opposite shoreline.
To license a site you must be a resident and have a current or past hunting license. There is a two day drawing in early august at the courthouse or another location.
You must have a resident with you if you are hunting in the sea duck or offshore waterfowl zone.
You can drift or scull in the offshore waterfowl zone, sea duck zone, monocacy, potomac, and some other river way out west that has a dam in the way and is too shallow anyway.
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The long and short of it is, yes, you will be able to find somewhere to hunt with a sneakbox or blind boat.
I do most of my hunting in a Bankes Goliath and have no trouble hunting all sorts of species from it. I've had blind sites in 1' of water where we shoot woodies, mallards, and geese, and I've had sites on big water for divers. It just takes some scouting and some weather to be successful.
If you get weather like we had this year, the divers get pretty concentrated and I know of a lot of folks that had success shooting them out in "the zone"
-D
