The apartment in a ship (steamer or sailing vessel) in which the charts, maps, instruments, etc., are kept.(noun)
The Century Dictionary (Public Domain)
Use "chart-room" in a sentence
"And it was told again, and by both of us, in the bright-lighted chart-room after the watches had been changed at eight bells."
""I noticed Captain West, in the chart-room, as I came up, sleeping like a baby," I concluded."
"And there, in the chart-room, a redoubtable sailorman bent anxiously over a chart as he measured and calculated, and measured and calculated again, our position and our drift."