Part III.— MISCELLANEOUS 



CHAPTER XIV. COMPASS RECORDS AND REPORTS 



132.^ The following excerpt from the Compass Record Book, NBS 

 Form 1101, covers the instructions for the navigating officer regarding 

 the magnetic compasses and the records to be kept on those compasses, 

 and embodies, in essence, the instruction given in the U. S. Navy Regu- 

 lations regarding the magnetic compasses on board ship. 



"The following instructions relative to compass observations 

 and records under cognizance of the Bureau of Ships are issued for 

 the information and guidance of the commanding officers and 

 navigators of the service. 



"1. Forms for compass work issued by the Bureau : 



{a) NBS No. 1101 — Compass Record Book. 



{h) NBS No. 1102 — Record of observations and results 

 obtained from swinging ships. 



(c) NBS No. 1103 — Napier diagram for curve of devia- 

 tions. 



{d) NBS No. 1104 — Deviation tables for all compasses. 



{e) NBS No. 1105— Deviation table for one compass. 

 (This form for ship's use only) 



(/) NBS No. 1106— Analysis of deviations. 



{g) NBS No. 1107 — Inventory of compasses. 



{h) NBS No. 1108 — Inventory of navigational instru- 

 ments. 



"2. The 'Compass Record' shall be a complete history of the 

 compasses while on board ship and shall contain copies of all com- 

 pass reports. It shall be kept by the navigator, who shall sign it 

 and submit it to the commanding officer for his approval on the 

 last day of every quarter. It shall be sent to the Compass Office. 

 U. S. Naval Observatory, when the vessel is put out of commission. 



"3. Upon receipt of the compass outfit it shall be carefully 

 inspected. The compasses shall, at the first opportunity, be tested 

 on shore for 'sensibility' and 'time of vibration,' in accordance 

 with the instructions contained on the back of NBS 1107. Com- 



^ For the duration of the war, all the NBS forms should still be maintained on board 

 ship in order to provide a complete history of the compasses, but only NBS Form 1104 

 (revised November 1943) need be submitted to the Bureau of Ships, except in cases of 

 special request. This form is submitted to the Bureau of Ships in lieu of all other NBS 

 forms after each and every adjustment and compensation. Details of this form and its 

 use are explained in articles 89 and 126, and on the reverse side of the form. 



Ill 



