CONTENTS 



Chapter 1.— PRELIMINARY 



Page 



1 1 . General statement 1 



111. Introduction. 112. The nautical chart. 113. The hydrographic survey. 

 114. The Hydrographic Manual. 



12. Project 8 



121. Project instructions. 122. Offshore limits. 123. Survey scales. 124. Units of 

 measurement. 125. Confidential surveys. 



13. Project planning 15 



131. Data from prior surveys. 132. Nautical charts. 133. Project study. 

 134. Operational plan. 135. Division of operations. 136. Project layout. 137. Sup- 

 plies and equipment. 



14. Organization of operations ^ 27 



141. General reconnaissance. 142. Personnel of survey units. 143. Tide stations. 

 144. Compass deviations. 145. Weather. 



15. Miscellaneous project operations 36 



151. Standard time. 152. Tide predictions. 153. Magnetic observations at sea. 

 154. Survey numbers. 155. Landmarks for charts. 156. Statistical and cost data. 

 157. Current surveys. 158. Navigation and seamanship. 159. Coast pilot reports. 



16. Geographic names 46 



161. Geographic names on the hydrographic survey. 162. Investigation of geographic 

 names. 163. Special report on geographic names. 164. Assignment of new names. 

 165. List of geographic names in Descriptive Report. 166. Examples of geographic 

 name information. 167. United States Board on Geographical Names. 168. Ter- 

 minology for submarine relief. 



17. Operations beyond project limits 56 



171. Sounding en route. 172. Reported shoals. 173. Erroneous soundings on the 

 chart. 174. Aids to navigation. 175. Coast pilot data. 176. Field examinations. 



Chapter 2.— CONTROL AND SIGNAL BUILDING 



21. Control J 59 



211. Definitions of control terms. 212. Frequency and spacing of control. 213. Ac- 

 curacy of control. 214. Recoverable stations. 215. Control station names. 

 216. Control stations of other organizations. 217. Datums. 



22. Triangulation 69 



221. General statement. 222. Reconnaissance. 223. Requirements. 224. Connec- 

 tion with triangulation of other organizations. 225. Recovery of stations. 226. Sta- 

 tion marks. 227. Description of stations. 228. Pseudo-triangulation methods. 



23. Topography 88 



231. General statement. 232. Accuracy of topography. 233. Aluminum-mounted 

 topographic sheets. 234. Hydrographic signals. 235. Recoverable topographic 

 stations. 236. Connection with control of other agencies. 237. Graphic control 

 surveys. 238. Special topographic methods. 239. Air photographic surveys. 



24. Shore hydrographic stations 103 



241. General statement. 242. Frequency of stations. 243. Methods of location. 

 244. Accuracy of location. 245. Station marks and descriptions. 246. Hydro- 

 graphic stations in inaccessible places. 247. Natural objects located from the vessel. 

 248. Records. 



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