2 

 ?. Arrangement of Universal Data and explanation of symbols- 



H 

 > 

 « 

 « 



O 

 Q 



o 

 o 



ft 



Q 

 < 



> 



I— I 



FIRST GROUP— Symbols PQLLL: 



P — Day of V)eek: See Code Table I. The observer will be careful to code the day of week as at Greenwich and not 

 the local day. When an observation is taken at 0000 G. M. T., the day of the week should be coded as the day 

 just beginning and not the day just ended. 

 Q — Octant of globe: See Code Table II. Determined by position of ship. Example: "Ship is in north latitude and 

 between 0° and 90° W." — code figure 0. 

 LLL — Latitude: Ship's position. (No code table necessary.) Record latitude in degrees and minutes but code in 

 degrees and tenths, the tenths being obtained by dividing minutes by 6 and neglecting the remainder. Example: 

 "Lat. N. 42° 38'"— code figures 426. 



SECOND GROUP— Symbols 111GG: 



111 — Longitude: Ship's position. (No code table necessary.) Record longitude in degrees and minutes and code in 

 same manner as for latitude. Example: "Long. W. 46° 22'" — code figures 463. If longitude is 100° or more, 

 omit the first figure (1). The fact that longitude is 100° or in excess thereof, will be indicated by the code figure 

 showing octant of globe (Q). Example: "Long. W. 123° 41' "—code figures 236. 

 GG — Time of observation, G. M. T.: (No code table necessary.) Greenwich mean time, 24-hour system. The day 

 begins at midnight (0000). Unless otherwise instructed, regular observations will be taken at midnight (0000) 

 and noon (1200). If observation is not taken on the hour, code the nearest hour. Example: "0000 G. M. T." — 

 code figures 00. See paragraph 22 regarding special observations. 



THIRD GROUP— Symbols DDFww: 



DD — Wind direction: See Code Table III. Direction from which wind is blowing. Record and code to 16 points, 

 using only code figures in full face type in Table III. Example: "SSE." — code figure 14. 

 F — Wind force (Beaufort) : See Code Table V. Record wind force according to Beaufort scale. Example : " Moderate 

 Gale" — code figure 7. 

 ww — Present weather: See Code Table VI. Weather at time of observation. Example: "Cloudy" — code figures 02. 



FOURTH GROUP— Symbols BBVTT: 



BB — Barometer: See Code Table VIII. Record corrected reading in inches or millibars, according to type of barom- 

 eter used on board. Example: "29.74 in." — code figures 07. (Note — Code figures 07 are last two figures of 

 the equivalent in whole millibars.) 

 V — Visibility: See Code Table XII. Example: "Poor Visibility" — code figure 5. 

 TT — Temperature of air (F.°) : (No code table necessary.) Record temperature to nearest whole degree Fahrenheit. 

 Example: "54°" — code figures 54. 



9. Arrangement of Supplemental Data (6) and explanation of symbols. 



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M 



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FIFTH GROUP— Symbols 6KdCN: 



6 — Group index: This is a code figure to identify the supplemental data being used. For these supplemental data 



the code figure is always 6 and is so entered in column (e). 

 K — Swell: See Code Table XIX. Character of swell. Example: "Heavy swell, long" — code figure 8. 

 d — Direction of. swell: See Code Table IV. True direction from which swell is moving. Example: "SW" — code 



figure 5. 

 C — Predominating cloud: See Code Table XVI. Example: " Strato-cumulus " — code figure 6. 



N — Cloud amount: See Code Table XVII. Amount of sky covered by clouds, recorded in tenths. Example: "0.7 

 to 0.8" — code figure 5. 



SIXTH GROUP— Symbols t d d s AWC a : 



t d — Temperature difference (air and water): See Code Table XVIII. Difference between temperature of air and tem- 

 perature of water at or near surface. Example: "Air 4° lower" — code figure 7. 



d„ — Course of ship: See Code Table IV. General direction toward which ship is moving, recorded to 8 cardinal points. 

 Example: "NE" — code figure 1. 



A — Barometric tendency: See Code Table IX. Give change during 3 hours preceding observation. Example: 

 " Barometer falling. Has fallen 0.08 inch in last 3 hours" — code figure 6. 



W — Past weather: See Code Table VII. General characteristics of weather during 3 hours preceding the observation. 

 Example: "Showers" — code figure 7. 



Ch — Form of tipper cloud: See Code Table XV. This relates only to forms of cirrus or cirro-stratus clouds. Example: 

 "Cirrus, fine, increasing" — code figure 4. 



