162 



HYDROGRAPHIC MANUAL 



to as the "Bridge Book," published by the 

 Corps of Engineers. Field parties shall meas- 

 ure bridges and cables only where charted 

 clearances are questionable, where definitive 

 information is lacking, or where there is 

 new construction. The district office of the 

 Corps of Engineers should be visited, if 

 practicable, and the charted or field clear- 

 ances compared with Corps of Engineers 

 files. Where Coast and Geodetic Survey and 

 Corps of Engineers values differ. Corps of 

 Engineers shall decide which value to use. 

 See Section 3-25 of Coast Pilot Manual. 



The location of bridges, overhead cables, 

 and shore ends of submarine cables shall be 

 determined and shown on boat sheets with 

 descriptive notes. 



5-83 Soundings at wharves and in docks. 



— Where there are wharves and docks within 

 the area of a hydrographic survey, accurate 

 sounding lines shall be run close to and along 

 the outer faces of the wharves and in docks 

 and slips (see 5-26). In addition to any 

 other lines that shall be run, soundings shall 

 be taken along the line likely to be occupied 

 by the keels of vessels berthing there. 



The soundings in the vicinity of wharves 

 and docks should be shown on subplans at 

 an enlarged scale wherever the scale of the 

 regular survey of the area is too small to 

 show the detail adequately. If the project 

 instructions require it, or if the importance 

 of the area warrants it, dock and slip areas 

 shall be surveyed at a large scale using one 

 of the control systems described in 5-126. 



5-84 Sounding records. — The fathogram 

 is the official record of the soundings when 

 an echo sounder is used. The sounding rec- 

 ord (Form 275) is the official record of posi- 

 tion data and of all soundings taken by lead- 

 line, pole, or wire. Many notes containing 

 supplemental or explanatory information are 

 inserted in the record book. The record 

 should be complete and self-explanatory. 

 From it, and the fathograms, it should be 

 possible to replot the survey at any future 

 date. Modern survey methods are compli- 

 cated and the records must be accompanied 

 by various reports containing information 



No. 45 EPI EQUIPMENT 



Ship Controller indicator No ^y~ ^ O'^ 



Ship Transmitter No ^7~ 77 



GrounrJ Sta Indicator 



Wind 31 



// 



/3 



No 50 



RAYDIST EQUIPMENT 



Ship Station No •Sf- V 



Red Station No ■^f - ^ 



Green Station No ^0~ Z 



Na 104 



SHORAN APPARATUS 



Station Name fitch Jiock 



Ship Set Number S/ff 



Shore Set Numbere I37Z _SZS 



ZERO SET 99.81't 99.8IH 



Figure 58. — Stamps used to record identifying num- 

 ber of electronic equipment being used. 



which cannot be shown in the record books 

 or on the smooth sheet, such as calibration 

 data. Coast Pilot notes, and descriptive 

 reports. 



The importance of clear and comprehen- 

 sive records and reports cannot be over- 

 emphasized, for the value of a survey is 

 impaired if the records and reports are in- 

 complete, unintelligible, or inadequate in 

 any respect. Satisfactory records can be 

 obtained only by the exercise of good judg- 

 ment and constant attention and care on the 

 part of all concerned. 



It is incumbent on the Chief of Party to 

 see that the records are arranged in the most 

 convenient manner for all concerned, that 

 all necessary records and reports are sub- 

 mitted at the proper time, and that they are 

 appropriately cross-referenced for easy ref- 

 erence and complete understanding. All rec- 

 ords and reports which pertain to one hy- 

 drographic sheet, and one only, should bear 

 the registry number of that survey. All rec- 

 ords and reports submitted on a seasonal or 

 project basis, so that they are applicable to 

 more than one hydrographic survey, should 

 make reference to the registry numbers of 

 all surveys to which they are applicable. The 

 descriptive report to accompany each hy- 

 drographic survey should refer to all of the 

 special, seasonal, or other reports and rec- 

 ords which contain any data pertinent to 

 the survey (see 1-^). 



5-85 Form 275, Soundings.— Form 275, 



Soundings, is the basic record book for all 



