The exceptions are found in Channels 2 and 3. The first three digits 

 of Channel 2 are still the day of the year; however, the last three digits 

 are now speed in knots and tenths: 3.5 knots. Channel 3 now indicates 

 the ambient light in lumens: 525 lumens. All other channels record the 

 same data as in Mode 1. , 



c. Mode 3 



In this mode the scanner is not used because of its slow 

 repetition rate. Wave height and roll angle signals go directly from 

 the counters into the digital recorder or the tape punch. The message 

 appears as a single line of data that is repeated every 0.6 second. 



6 8 110 12 

 6 8 5 4 

 6 9 15 



The first three digits of each line indicate the distance to the surface 

 in feet and tenths: 69.0 feet, 68.5 feet, and 68.1 feet. The fourth 

 digit shows the direction of roll: = port, 1 = starboard. The last 

 three digits show the roll angle in degrees and tenths: 1.5° to port, 

 0.4° to port, and 1.2° to starboard. 



An example of punched tape containing the same information as the 

 message for Mode 1 is shown below. Here, each channel (data word) 

 is prefixed by two digits to indicate the data format; format 03 is 

 shown. Each data word is separated by a tab and a space. The tab 

 allows columnated reproduction on the Flexowriter, and the space 

 is a requirement by the computer for separating data words. 



An x-y recorder may be incorporated, as shown in Figures C-l and 

 C-2, to record the variation in certain events during a change in depth. 

 Likewise, a strip chart recorder may be used to record the variation 

 of an event like ambient light with time. 



C-9 



