Page 727 



THE SMOOTH SHEET 



775 



An example of a right-hand page from the Sounding Record of three-point fix 

 hydrography is illustrated in figure 164. Typical errors and omissions are shown, to- 

 gether with the proper method of checkmarking and correcting them. The corrections 

 should be made by the smooth-sheet plotter according to the following general instruc- 

 tions : 



(a) All corrections and notes in the Record must be made in colored pencil, the same as used for 

 checkmarking the positions (see 7624), in order that it will be clear what data were used for plotting 

 the position and that it was not a correction made in the field at the time of recording the data. 



(6) The original recorded data shall never be erased, no matter how certain the plotter may be as 

 to the correct entries. Such corrections should be made by crossing out the recorded data and, where 

 practicable, entering the correct data above the erroneous data. But in any case, the correct data 

 should be so entered that no mistake in interpretation can be made. 



(c) The reason and authority, if any, for the revision shall be entered. 



After the smooth sheet has been completed, it should be in complete agreement 

 with the corrected Sounding Record. No positions should appear on the smooth sheet 

 except those which are based on data in the Sounding Record, or are fully explained by 

 supplemental entries; neither should any depths be penciled on the smooth sheet which 

 do not appear in the Sounding Record or on the fathogram. It should be possible at 

 any time in the future to justify any information on the smooth sheet by reference to 

 the Sounding Record or fathogram. 



775. Congested Areas 



Cases frequently occur where it is impossible to show adequately parts of surveys 

 at the scale of the smooth sheet. Among these are: (a) intensely developed small 

 areas; (b) soundings taken in small docks and alongside small piers; (c) large water 

 areas developed with two or more systems of lines. Clarifications in (a) and (6) are 

 accomplished by means of subplans at enlarged scales (see 7751), and in (c) by means 

 of overlay tracings (see 7752) . 



775i. Subplans 



Small congested areas shall be shown at enlarged scales in subplans in otherwise 

 blank spaces on the smooth sheet, where practicable. The scale and extent of the plan 



135°20' 



(OJOE 



I 

 Scale 1:10,000 



OMAG 



135°20' 



Ofat 



OHer 



57°00 



NITAL COVE 



135°20' Scale 1:2,500 



Figure 165. — Subplau of small cove on smooth sheet. 



shall be large enough to show the positions and soundings clearly, and to include the 

 stations used to control the hydrography to be plotted thereon. 



