The person I received these from indicated that they had been removed from a naval academy training vessel. I do not have any further information in that regard. The four units are marked Pilot Hours, Fwd. Chart room, Aft Chart room and EOS. I have no way of testing these units. These would need to go in two large boxes as they weight about 20 lbs each. This item is in the category “Collectibles\Transportation\Boats & Ships\Military\Other Naval Collectibles”. The seller is “lostships” and is located in this country: US. This item can be shipped to United States.