Device Used by Ships to Determine Wind Direction
Puzzle 13 of At the Ballet Hard Pack
Question is: Device Used by Ships to Determine Wind Direction
and the answer is: DOGVANE
Word Meaning:
DOGVANE — (nautical) A small vane of bunting, feathers, or other light material, fastened to the end of a short staff and placed on the weather gunwale of a sailing ship to assist the helmsman to judge the direction of the wind.
Definitions from Wiktionary.