Maryland Natural Resources Section 10-603
§ 10-603.
  (a)   Except while lawfully hunting under the requirements of this subtitle, a person in a boat may not purposely or unnecessarily disturb wild waterfowl.
  (b)   A person may not hunt wild waterfowl while using a floating device towed by a power boat or a sailboat.
  (c)   A person may not hunt wild waterfowl from a boat, sinkbox, or device that allows the hunter to be completely concealed beneath the water.
  (d)   (1)   A person may not hunt wild waterfowl from a boat that is propelled by a motor or under sail.
    (2)   A person may shoot and immediately retrieve lawfully wounded or killed wild waterfowl while in a boat if all forward progress of the boat has ceased and the motor has been shut off.
    (3)   Crippled birds may be shot from a boat under power in the area open for the special sea duck season.