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Page Title: How to Determine Daily Rates
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How to Determine Daily Rates Figure  5-6.  Excerpt  from  the  Timepiece  Rate  Book. Average Daily Rate  (ADR) Example:  a chronometer whose rate is +1.5 seconds will gain 1.5 seconds every  24  hours.  Chronometer  rate  is  usually  expressed  as  seconds  and tenths  of  seconds  per  day  and  is  labeled  gaining  or  losing.  Chronometer rate is determined by comparing errors obtained several days apart and dividing the difference by the number of days between readings. Date 17  July 18  July Correct GMT  (UTC) 11h 30m 00s 11h 30m 00s Chrono. time 11h 32m 00s 11h 32m 01s Average daily rate (ADR) is found by using the formula: (error on last day observed) - (error on first day observed) ADR= (date of last observation) - (date of first observation) ADR  formula  for  a  3  l-day  month.  A  navigator  desiring  to  determine  the chronometer rate compares the chronometer directly with the Washington, D.C.,  (NSS)  1200  radio  time  signal  on  different  days.  On  the  first  day  the chronometer reads fast by 9 minutes 3.0 seconds and on the last day it reads  fast  by  9  minutes  53.5  seconds.  ADR  is  found  as  follows: ADR =(F) 09m 53.5s - (F) 09m 3.0s (31) - (1) 50.5s  diff  = 30 days No attempt should be made to determine chronometer error closer than l/2  (0.5)  second.  Average  daily  rates,  therefore,  are  somewhat  a  more accurate measurement of the chronometer’s performance than are the daily checks because, in the former method, any daily observational errors are averaged out. 5-18 Error 02m 00s 02m 01s Chrono. rate +ls = 1.68s/gaining

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