5-2 Assist the OOD and the junior officer of the watch (JOOW) and supervise and instruct sentries and messengers. Wear   the   prescribed   uniform   and   ensure orderliness of watch standing equipment during each morning watch. Carry out the daily routine and orders as the OOD may direct. Notify the OOD and the JOOW of any changes in  the  weather  or  changes  in  barometric  pressure readings of .04 inch or more in any one hour. The quartermaster of the watch, when assigned, will assume this responsibility. In all classes of submarines, hourly observe and log draft readings. Ensure draft readings are reviewed periodically by the in-port duty officer. Make entries in the deck log for all events of interest as directed by the OOD. Erasures should not be made in the deck log. The quartermaster of the watch, when assigned, will assume this responsibility. Ensure the messenger makes the calls listed in the call book kept on the quarterdeck. The quartermaster of   the   watch,   when   assigned,   will   assume   this responsibility. Return salutes and carry out the watch routine for the OOD or the JOOW when neither is at  the gangway. Call away boats in sufficient time to make sure that  they  are  ready  to  leave  the  ship  at  the  time prescribed in the boat schedule. Keep a list of personnel (such as boat crews) expected to be absent on duty from the ship during meal hours. Notify the ship’s duty cook of the approximate number of personnel that will be absent and the time they will return for the meal. Assemble  liberty  parties  in  ample  time  for inspection by the OOD before departure of scheduled liberty boats. Perform other duties as directed by the OOD or JOOW. These duties may seem like a lot to do while on watch, but you probably have observed and are familiar with many of them, having stood sentry or messenger watches in the past. While you are standing POOW, you should be alert for the display of significant flags and pennants from other ships. You should ensure the correct display on your ship. This area will be covered later in this section. Another of your responsibilities is knowing how to operate any of the equipment found on the quarterdeck and bridge. Quarterdeck and Bridge Equipment The Navy has many different types and classes of ships. Each ship type has installed equipment to enable that ship to do its job. It would be impossible to describe each and every piece of equipment that can be found on the bridge of each ship. Each ship in the Navy contains instruments  or  apparatuses  that  are  used  for  the following purposes: Steering Depth sounding Indicating ship’s head Indicating rudder angle Measuring speed Measuring temperature and atmospheric pressure Measuring wind direction and speed Communicating speed orders to engine room Taking bearings and ranges Making celestial observations Controlling running, anchor, aircraft, and warning lights Indicating revolutions made by the engines