Chapter 5 — BATHYTHERMOGRAPH 



50 55 



60 65 ^0 ^5 80 85 9o 



0064 7 



73552 



90492 



SELECTION OF SIGNIFICANT VALUES 

 TO BE REPORTED 



71.93 



Figure 5-20. — Trace readout. 



Item 4— Octant of Globe 



Record the octant of the globe as follows: 

 North latitude 



— 0° to 90°W. 



1 — 90°W to 180°. 



2 — 180° to 90°E. 



3 — 90°E to 0°. 



Items 5 and 6 — Position 



Record the degrees and minutes of latitude 

 and longitude, respectively. Prefix with zeroes 

 when necessary to complete the degrees boxes. 

 Example: Latitude 5°30' is recorded as 0530; 

 longitude 9°45' is entered as 00945. 



Item 7 — Reference Temperature 



Enter the code and figures that are recorded 

 in item 14 of the environmental data section. 



BT TRACE READINGS 



When entering the depth-temperature read- 

 ings, adhere to the following directions. 



Symbol 

 ZZ 



Water depth in feet. ZqZq is the 

 surface, preprinted as 00 on the log- 

 sheet. Depths of subsurface temper- 

 ature changes are recorded in tens 

 of feet; e.g., 140 feet is recorded 

 as 14. 

 TTT Temperature. TqTq is the surface 

 temperature. Subsurface tempera- 

 tures are symbolized by TzTzTz^ 

 Record the temperature to the near- 

 est 0.1°F or C. 



All messages must terminate with message 

 suffix figures 19991. 



Along the right edge of the radio message 

 section, record the GMT date-time group of the 

 BT message, and the month and year the message 

 was sent. 



A sample BT radio message is shown in 

 figure 5-21. It follows the information contained 

 in the radio message section of figure 5-19. 

 Note that the radio message is not sent to the 

 National Oceanographic Data Center. Only the 

 logsheets and slides are sent to NODC. The 

 addressee for the BT message is governed by 

 your ship's location. 



83 



