1761 Page 58 



the position of a new aid to navigation, (c) the determination of the least depth on a 

 shoal of small area or the investigation of an area in which one has been reported. 



The results may be transmitted to the Office on a section of a planimetric map, if 

 there is one of the area, or on a section of the largest-scale chart of the area. 



1761. Advance Information 



It is sometimes required that survey data in a small but important part of the proj- 

 ect area be submitted to the Washmgton Office in advance of the completion of the 

 entire survey. The required data may be traced on a piece of tracing paper containing 

 meridians and parallels at the scale of the survey. These may be used for a preliminary 

 correction of the chart but will be destroyed at a later date after the complete survey 

 has been received and verified in the Washington Office. 



