@CkzErz if your son likes to read, books with a maritime theme might make a nice high school graduation gift..
Here are few I would recommend..
- Looking for a Ship [about life shipping 'off the board' out of a hiring hall as a deck officer in the US Merchant Marine] by John McPhee
- It Didn't Happen on My Watch [sea stories written by a former US Lines Chief Engineer from the engine room floor plate perspective] by George E. Murphy.
- Nothing Can Go Wrong [about the last voyage of the Pacific Far East Lines passenger ship SS MARIPOSA] by John D. MacDonald and Captain John D. Kilpack
- A Man and His Ship [about Naval Architect William Francis Gibbs and his quest to build the liner SS UNITED STATES] by Steven Ujifusa
- Until the Sea Shall Free Them [about the loss of the MARINE ELECTRIC] by Robert Frump
- Into the Raging Sea [about the loss of the EL FARO] by Rachel Slade
- Longitude [about the quest for a solution to solving the 'longitude problem' at sea.] by Dava Sobel
- America Spreads Her Sails - U.S. Seapower in the 19th Century by the U.S. Naval Institute Press [series of short stories compiled and edited by Clayton R. Barrow]
- The Abraham Lincoln of The Sea [biography of Andrew Furuseth, renowned sailor and maritime labor leader] by Arnold Berwick
Also any of the classics by Joseph Conrad.. [Typhoon, Youth, Lord Jim, The Mirror of the Sea, etc.] or Herman Melville, Richard Henry Dana or Guy Gilpatric [the Glencannon series books]..