IDENTIFICATION  DATA The identification data contains the data type, the location  identifier  and/or  location,  and  the  date-time group. The format is identical to the TEMP code, Part B:  M_iM_iM_jM_j  YYGGa₄  IIiii  is  used  with  the  PILOT code,   while   PILOT   SHIP   and   PILOT   MOBIL   use M_iM_iM_jM_j   D....D   YYGGa₄   99L_aL_aL_a   Q_cL_oL_oL_oL_o MMMU_LaU_Lo   h_Oh_Oh_Oh_Oi_m.   The   same   identification data format is used in all four parts of the report. PART  A  -  LOWER  MANDATORY LEVELS Part A of the message contains identification data; mandatory  level  winds.  and  the  maximum  wind  and wind shear values. Mandatory Level Winds After the identification data. the first section of the PILOT code Part A is the winds at the mandatory levels in the format 44nP₁P₁ or 55nP₁P₁ ddfff ddfff ddfff. The 55nP₁P₁ group is used only when the altitudes of the pressure  levels  are  based  on  standard  altitudes  above mean  sea  level.  The  44nP₁P₁  group  is  used  when  the altitudes  are  obtained  from  pressure  equipment.  such  as a  radiosonde.  This  cluster  of  four  five-digit  groups, reporting winds at three mandatory levels, is repeated four times to include all the mandatory levels through the 100-hPa level. In  the  first  group.  the  n  indicates  the  number  of standard levels reported in the section and the number of ddfff groups that follow. This figure is usually a 3, but may be a 1 or 2  in the last repetition. The P₁P₁ is the hundreds  and  tens  value  of  the  first  pressure  level reported. The  ddfff  group  reports  wind  directions  (dd)  and wind  speeds  (fff).  As  in  the  TEMP  code.  the  units  of wind speed are meters per second if the date, YY. in the identification  data  is  simply  the  UTC  date.  When  the wind speed units are reported in knots, 50 is added to the date.  All  wind  directions  in  the  PILOT  code  are reported to the nearest 5 degrees. For example. the coded groups 43300 09535 08058 06601 indicate winds at three pressure levels (from a radiosonde).  starting  at  the  1,000-hPa  level  ("00").  095° at 35 knots: the 925-hPa level. 080° at 58 knots; and the 850-hPa level. 065° at 101 knots. Maximum Wind The following five different formats are used for the indicator  group  of  the  level  of  maximum  wind  or  a secondary level of maximum wind: 66P_mP_mP_m—maximum  wind  at  top  of  sounding, measured pressure level reported. 6H_m H_m H_m H_m —maximum   wind   at   top   of sounding. standard altitude reported in meters. 77P_mP_mP_m—maximum   wind   within   sounding. measured pressure level reported. 7H_mH_mH_mH_m—maximum  wind  within  sounding. standard altitude reported in meters. 77999—no maximum wind observed. The  P_mP_mP_m  is  the  measured  pressure  level  in hectopascals   and   H_mH_mH_mH_m  is  the  altitude  in decameters  (units  rounded  off.  hundred-thousands value not reported). A maximum wind level must have a wind speed in excess of 60 knots and occur above the 500-hPa level. A secondary maximum wind level may also be reported. Following the maximum wind indicator group, the wind is reported in the format ddfff, and the optional vertical wind-shear group, 4v_bv_bv_av_a, may be reported the same as in the TEMP code. PART B - LOWER SIGNIFICANT LEVELS This  part  of  the  PILOT  code  message  contains identification   data,   reports   of   winds   at   significant levels, and regional and national coded information for the levels up through 100 hPa. In WMO Region IV, the fixed  regional  levels  (PPBB)  replace  any  significant levels (section 6, Part B of TEMP Code). Significant Level Winds When  only  significant  levels  are  reported.  as indicated  by  the  identifier  group  21212.  each  level  is encoded in two five-digit groups in the format nnPPP ddfff. The nn indicates the level (number 00 for surface, and then upward from 11 through 99, and repeating as necessary.  The  PPP  is  the  pressure  for  the  level.  The ddfff is the wind direction and speed, just as reported for the mandatory levels. Fixed Regional Level Winds When this section is used to report winds at fixed regional levels, a slightly different format is used. The 1-30