Page 251 hydrography 3412 



sheet. This approval shall serve as a general approval by the Chief of Party of the 

 smooth sheet and all associated records which are forwarded as part of the survey data. 



3412. Officer-in-Charge 



The ofRcer-in-charge of each survey unit is in charge of all survey operations of 

 that unit, issues all of the necessary orders, and is responsible for the adequacy and 

 accuracy of the results; he is also responsible for the safety of the vessel, the personnel, 

 the equipment, and the care which is taken of the equipment. 



Almost invariably the officer-in-charge plots the fixed positions on the boat sheet, 

 issues the necessary orders to the helmsman, selects the objects to which the sextant 

 angles are taken, and orders the intervals between successive positions and the intervals 

 between soundings. 



In most cases of three-point fix control the officer-in-charge observes one of the 

 angles, preferably the left. 



The officer-in-charge of a launch party, or a party where watches are not changed 

 throughout the day, shall be responsible for the accuracy and adequacy of the data in 

 the Sounding Record. He should train himself to hear subconsciously all soundings, 

 angles, and other data which are called out and repeated, so as to know at all times the 

 depths being obtained and whether the data being recorded are correct. At the end 

 of each day's work he shall approve the record for that day over his signature. 



For hydrography on a survey ship operated on a watch basis, where the oflScer- 

 in-charge of the bridge is relieved during the day, he shall be responsible for that part 

 of the recorded data which occurred during his watch and shall approve that part of 

 the record over his signature at the end of the watch. 



3413. Anglemen 



The anglemen observe the sextant angles for the fixed positions in three-point fix 

 control. Usually the left angle is observed by the officer-in-charge. The right angle 

 may be observed by the recorder but is most frequently observed by a junior officer. 

 It is in tliis position that the junior officer acquires the knowledge and experience which 

 permit him subsequently to serve as officer-in-charge. In addition to taking the right 

 angle, the right angleman supervises the work of the recorder, keeping a constant check 

 in order to ensure that all of the required data are recorded in the Sounding Record (see 

 818). He also oversees the sounding operations and, when not otherwise engaged, 

 keeps a lookout ahead when for any reason this is necessary. The special notes that 

 should be entered in the "Remarks" column of the Sounding Record (see 815) are 

 frequently given to the recorder by the right angleman. 



Two anglemen in addition to the officer-in-charge are generally required on a ship 

 where the objects are distant or faint, or where survey buoys are used as control 

 stations. 



3414. The Recorder 



The recorder keeps the official written record and notes of the hydrographic survey 

 in the Sounding Record. He records the depths as reported by the leadsman or the 

 fathometer attendant, the sextant angles observed by the two anglemen, or other control 

 data, and all dead-reckoning data, with the respective times of the various events. 

 He also records all pertinent notes in the "Remarks" column (see 815). 



For more complete instructions as to the manner in which the Sounding Record 

 shall be kept, see 811 to 816 inclusive. 



