Answer: SEALEGS

Sealegs refers to the ability to adjust to the motion of a ship or boat, typically after spending some time at sea. It is a term used to describe someone who is accustomed to the motion of being on a ship and has their balance and sea-adapted ability to walk steadily on board. A landlubber, on the other hand, is someone who is not accustomed to being at sea and lacks sealegs. Essentially, sealegs allow a person to maintain a steady footing on a moving ship.

Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Good standing in the Navy?. Explanations are generated by AI and may be inaccurate.