or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between ship placement and shading modes. In ship placement mode, right click gives sea, left click gives circle/square, left click and drag for rounded ships.)
Theme: The Bermuda Quadrangle? The missing radar clues will complicate the solve.
Rules: Standard Battleships rules.
Answer String: For each row from top to bottom, enter the number of the first column from the left where a ship segment appears. If the row is empty, enter 0. Enter these numbers as a single string with no separators.
Time Standard: Battleships Grandmaster = 3:45, Master = 7:00, Expert = 14:00
Note: Advice on solving this puzzle has now been posted in “Ask Dr. Sudoku #8“