The vessel, named Oliva, will leave from Gaza City fishing port with crew from Spain, the US, Sweden and the UK, and accompany Gaza fisherman in the waters, organizers said in a statement released Tuesday.
"Violations of international law will be monitored, documented, and disseminated," the release from the Civil Peace Service said.
The organization said the initiative is in cooperation with local groups including the Palestinian Center for Human Rights, the Popular Struggle Coordination Committees, the Union of Agriculture Committees and Fishing and Marine Sports Association.
Israeli military vessels monitor the Gaza coast and enforcing a fishing limit of three nautical miles and blockade of the Gaza Strip, with fishermen reporting fire, boat confiscations and detentions by the navy.
Last Wednesday, fishermen said one skiff was hit by an Israeli ship and sunk, injuring a fisherman, off the southern Gaza coast.