Table 7.— BOTTOM TYPE CODE 



Code Description 



Not otherwise specified. 



1 Mud or ooze. 



2 Sand and mud. 



3 Sand. 



4 Sand, with shells and/or gravel. 



5 Shells. 



6 Gravel. 



7 Rock. 



8 Coral. 



9 Stone. 



Table 9.— WIND FORCE CODE— BEAUFORT'S 

 SCALE AND VELOCITY 



(WMO Code 30) 



Table 8.— COMPASS DIRECTION CODE 

 True Direction From Which Surface Wind is Blowing 



or From Which Wave System is Approaching, in 



10° intervals. (WMO Code 23) 

 Code 



00 Calm. 



01 5° to 14°. 



02 15° to 24° NNE. 



03 25° to 34°. 



04 35° to 44°. 



05 45° to 54° NE. 



06 55° to 64°. 



07 65° to 74° ENE. 



08 75° to 84°. 



09 85° to 94° E. 



10 95° to 104°. 



11 105° to 114° ESE. 



12 115° to 124°. 



13 125° to 134°. 



14 135° to 144° SE. 



15 145° to 154°. 



16 155° to 164° SSE. 



17 165° to 174°. 



18 175° to 184° S. 



19 185° to 194°. 



20 195° to 204° SSW. 



21 205° to 214°. 



22 215° to 224°. 



23 225° to 234° SW. 



24 235° to 244°. 



25 245° to 254° WSW. 



26 255° to 264°. 



27 265° to 274° W. 



28 275° to 284°. 



29 285° to 294° WNW. 



30 295° to 304°. 



31 305° to 314°. 



32 315° to 324° NW. 



33 325° to 334°. 



34 335° to 344° NNW. 



35 345° to 354°. 



36 355° to 4° N. 



99 Direction variable or un- 

 known. 



188 



H. O. 607 



