Since this is question section I will answer the question. HannaS77 is the same person as the author of this article. The article does not cover scattering of ashes at sea. For this you need to contact the Captain or staff. I was on a ship where someone scattered ashes from a midship balconey onto passengers on a lower deck.
BURIAL AT SEA
by Hermann Paul Schlander
Information on burial of a body of a deceased cruise ship passenger at sea is rather limited The subject aroused my interest when a cruise ship passenger complained the Captain would not bury her husband, who had died of a heart attack while the vessel was at sea. The action or lack thereof is understandable for only under certain conditions can a ship Captain dispatch a dead body into the sea. A problem confronting the Captain might be there was no autopsy by someone qualified. Rules applying to dead bodies aboard a ship at sea are based on custom, some of which may be archaic. Another impediment is that the ship doctor cannot embalm the body since he could ultimately be sued for mutilating the body. The following are some rules based on custom applicable to dead bodies at seas.
"Where the ship passenger's death occurred more than five days before the end of the voyage, or from the nearest port, the ship's Master has no duty to embalm the body, in fact is under no duty to do so under pain of possible lawsuit for mutilation of the body. The Master has the absolute discretion concerning proper disposition of the corpse, the custom to burial at sea having long been associated with usage."
"Cruise ships may have the capacity to hold the body, such as a cold storage locker until the ship reaches a port where the body can be turned over to the Consul or Embassy of the nationality of the deceased passenger or to local authorities."
There are only a very few lawsuits over the disposal of dead bodies at sea and these are over 50 years old. One lawsuit has been decided over the disposal of a body while sea rather than the refusal of the ship's Master to bury the body at sea.
The writer is not a lawyer nor giving legal advice. For that rely on an attorney. The information is for reader information and interest.