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Page Title: Reducing Sights Using Pub 249
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Reducing Sights Using Pub 249 General HO  Pub  249,  Sight  Reduction  Tables  for  Air  Navigation  and  the  Air Almanac,  can  also  be  used  to  reduce  sights.  This  method  of  sight reduction  is  used  by  some  navigators;  however,  the  degree  of  accuracy  is slightly  less  than  sight  reduction  by  Pub  229. Procedure Once  again,  you  would  have  to  gather  information  to  reduce;  that  is, GMT,  sextant  altitude,  and  so  on. For  our  example  problem,  we  will  use  the  following  data: Date: 30  March  1985 Lat: 36°  40.1'N hs: 40° 33.6' Hgt  of  Eye:  50  ft GMT: 06 26 21 Long:  017°  31.6'  W IC: + 0.8 OPNAV  3130/32 ACTION Completed   Strip H.O.249  Air  Alm Form Body Enter  the  name  of  the  body. REGULUS GMT Enter  time  of  sight. 06h 26m 21s IC Enter  the  index  correction. + 0.8 D Enter  the  dip  correction  (hgt  of  eye  50ft) - 7.0 using  the  altitude  correction  table  from  the Air  Almanac.  (See  fig.  9-16.) R o This  is  the  refraction  correction  from  the - 1.0 Air  Almanac.  (See  fig.  9-17.) SD ha Total  Corr  (sum) hs Ho Total  of  IC,  D,  and  R  o. - 7.2 Enter  the  sextant  altitude. 40° 33.6' Apply  altitude  corrections  to  find. 40° 26.4' 9-32

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