A vessel can be almost any kind of boat or ship. However, it is important to note that the vessel must be “in navigation” to qualify a seaman to bring a claim under the Jones Act. To be “in navigation,” a vessel must be: Afloat, In operation, Capable of moving, and On navigable waters. Thus, if one or more of the above elements is not present, the object will not be considered a vessel in navigation. Common examples of what is not considered a vessel in navigation include oil drilling platforms or floating casino barges.