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Chronometer Error, Continued - 14220_162
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How to Determine Daily Rates - 14220_164
Documenting Chronometer Error Navigational Information  concerning  each  chronometer  (error,  successive  daily  rate,  and Timepiece  Rate average daily rate) must be recorded in the  Navigational  Timepiece  Rate Book Book,  NAVSEA  4270.  (See  fig.  5-6.)  Each  page  of  NAVSEA  4270  can accommodate the records of a maximum of three chronometers for 1 month. How to Check and  Record Error Use  the  following  table  to  check  and  record  chronometer  error.  You  will need pencil, paper, and a comparing stopwatch handy. New  Time Source Step Action 1. Obtain a time tick signal from the communications center. 2. Determine from the time tick the next minute that will be sounded;  write  this  value  down.  When  the  signal  is  sounded, start the comparing watch. 3. At  the  exact  moment  the  comparing  watch  marks  on  the  minute, note  the  exact  time  for  chronometer  1.  Write  down  the  time  for chronometer 1. 4. Compare  the  two  time  values  and  determine  the  difference  of time. It is always preferable to change the larger time value to ease  addition  or  subtraction.  In  our  example,  the  comparing watch  time  is  the  larger  value  and  equals  1  lh  15m  00s.  This converts to 11h 14m 60s. 5. 6. Example: Comparing  watch llh  14m  60s  GMT Chrono time -  llh  14m  43s  GMT Chrono  error 0h   00m17s Record  results  in  the  Timepiece  Rate  Book,  compare  the  results with  the  previous  day  and  compute  the  difference,  assign a - value if the chronometer is slower; assign a + value if the chronometer is faster. Repeat  steps  l-5  for  the  remaining  chronometers,  replacing chronometer 1 with the chronometer you are comparing. At  the  time  of  publishing  of  this  TRAMAN,  the  use  of  GPS  time  as  the single source reference for setting ships time has not been approved. However, the use of GPS time signals may be approved in the near future. Check  with  your  Type  Commander  Staff  Navigator  for  guidance  on  this matter. 5-17

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