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ARL (Admiralty Research Laboratory) table: located aft and on starboard side of control room. Mostly used when surfaced. Map lies on top of it and periscope navigational fixes taken from landmarks are applied to chart to calculate submarine’s position in conjunction with SINS.

attack team: warfare team under guidance of XO reporting to captain, who has overall command. Consists of sonar team, tactical systems team, warfare seaman officers, XO and captain.

auxiliary vent-and-blow system: back-up vent-and-blow system in case of failure of main systems. May be used for diving and surfacing of submarine.

bathythermograph: instrument to measure changes in water temperature at different depths. Also used to measure velocity of sound in water. Sensors located in top of fin and keel.

BRN mast: supplies submarine with instantaneous navigation information to lock down its latitude and longitude at PD.

bubble: ‘up bubble’ means bow of submarine is angled up; ‘down bubble’, bow angled down; ‘zero bubble’, boat kept steady on depth. Controlled by afterplanesman.